Add gitbook documentation (support PDF generation).

To generate PDF doc:
 ./gendocs.sh pdf

To generate HTML doc (local webserver):
 ./gendocs.sh serve

Change-Id: I77156a45e86f3bcab045cee05694f93b7a50e4ba
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

3 files changed, 624 insertions, 0 deletions

diff --git a/docs/resources/cover.svg b/docs/resources/cover.svg
new file mode 100644
index 00000000..21e9e9f2
--- /dev/null
+++ b/docs/resources/cover.svg
@@ -0,0 +1,212 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="1800"
+   height="2360"
+   viewBox="0 0 1800 2360"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.91 r13725"
+   sodipodi:docname="cover.svg">
+  <defs
+     id="defs4175">
+    <filter
+       style="color-interpolation-filters:sRGB"
+       inkscape:label="Drop Shadow"
+       id="filter4000">
+      <feFlood
+         result="flood"
+         flood-color="rgb(0,0,0)"
+         flood-opacity="0.475"
+         id="feFlood4002" />
+      <feComposite
+         result="composite1"
+         operator="in"
+         in="flood"
+         in2="SourceGraphic"
+         id="feComposite4004" />
+      <feGaussianBlur
+         result="blur"
+         stdDeviation="5"
+         id="feGaussianBlur4006" />
+      <feOffset
+         result="offset"
+         dy="8"
+         dx="8"
+         id="feOffset4008" />
+      <feComposite
+         result="composite2"
+         operator="over"
+         in="SourceGraphic"
+         in2="offset"
+         id="feComposite4010" />
+    </filter>
+    <filter
+       style="color-interpolation-filters:sRGB"
+       id="filter4000-6"
+       inkscape:label="Drop Shadow">
+      <feFlood
+         id="feFlood4002-4"
+         flood-opacity="0.475"
+         flood-color="rgb(0,0,0)"
+         result="flood" />
+      <feComposite
+         id="feComposite4004-6"
+         in2="SourceGraphic"
+         in="flood"
+         operator="in"
+         result="composite1" />
+      <feGaussianBlur
+         id="feGaussianBlur4006-2"
+         stdDeviation="5"
+         result="blur" />
+      <feOffset
+         id="feOffset4008-8"
+         dx="8"
+         dy="8"
+         result="offset" />
+      <feComposite
+         id="feComposite4010-9"
+         in2="offset"
+         in="SourceGraphic"
+         operator="over"
+         result="composite2" />
+    </filter>
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="0.24748737"
+     inkscape:cx="303.38436"
+     inkscape:cy="1108.7164"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:snap-text-baseline="false"
+     units="px"
+     inkscape:window-width="1920"
+     inkscape:window-height="1171"
+     inkscape:window-x="1920"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     showguides="false" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,1307.6379)">
+    <g
+       id="iotbzh-logo"
+       transform="matrix(2.3917866,0,0,2.3917866,216.6324,-1946.4393)"
+       inkscape:export-filename="Pictures/Logo/logo_iot_bzh_100dpi.png"
+       inkscape:export-xdpi="100.22011"
+       inkscape:export-ydpi="100.22011"
+       style="display:inline;filter:url(#filter4000-6)">
+      <text
+         sodipodi:linespacing="125%"
+         id="text3557-5-3-7-0-7-3"
+         y="519.50671"
+         x="27.886671"
+         style="font-style:normal;font-weight:normal;font-size:97.09867096px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;display:inline;fill:#000000;fill-opacity:1;stroke:none"
+         xml:space="preserve"><tspan
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:97.09867096px;line-height:125%;font-family:FreeEuro;-inkscape-font-specification:'FreeEuro Bold';text-align:start;writing-mode:lr-tb;text-anchor:start"
+           y="519.50671"
+           x="27.886671"
+           id="tspan3559-5-4-1-5-0-6"
+           sodipodi:role="line">IOT</tspan></text>
+      <path
+         inkscape:connector-curvature="0"
+         d="m 286.73007,473.23356 c 28.21686,16.29102 28.75566,58.73779 0.99693,78.53831 -7.67688,5.47598 -8.77935,4.91028 -1.99529,-1.0238 17.47377,-15.28453 17.98492,-42.17775 1.08522,-57.09786 l -3.91266,-3.45435 0.72312,-3.71053 c 0.39771,-2.04076 0.5997,-5.73115 0.44885,-8.20083 -0.33876,-5.54623 0.15803,-6.49185 2.65383,-5.05094 z m -64.76568,11.40332 c 7.06047,-7.74198 18.64659,-14.16089 29.04027,-16.08874 l 6.87489,-1.27521 0.87404,2.89709 c 0.4807,1.59343 0.67439,5.2245 0.43037,8.06906 l -0.44364,5.17195 -6.13887,1.6918 c -10.91241,3.00731 -20.4022,10.85909 -25.4533,21.05979 l -2.41633,4.87984 -2.74281,-0.41238 c -5.14252,-0.77316 -12.72985,-3.97645 -12.79123,-5.40033 -0.092,-2.13451 8.34659,-15.74625 12.76661,-20.59287 z m 33.20546,36.39493 c -28.21687,16.29101 -65.24624,-4.46574 -68.51461,-38.40577 -0.9039,-9.38637 0.13723,-10.0583 1.88428,-1.21608 4.49989,22.77499 27.53453,36.66428 48.90556,29.48876 l 4.94788,-1.66128 2.85184,2.48149 c 1.56852,1.36481 4.66349,3.38493 6.87772,4.48914 4.97257,2.47973 5.54308,3.38282 3.04733,4.82374 z m 22.50729,-61.79039 c 3.17451,9.98553 2.94038,23.22889 -0.58688,33.19399 l -2.33309,6.59143 -2.94597,-0.69161 c -1.6203,-0.38041 -4.86173,-2.02821 -7.2032,-3.6618 l -4.25721,-2.97018 1.60429,-6.16234 c 2.85178,-10.95404 0.79685,-23.09833 -5.51167,-32.57307 l -3.01788,-4.53253 1.72854,-2.16916 c 3.24083,-4.06698 9.80863,-9.03614 11.07242,-8.37738 1.89457,0.98756 9.46336,15.1015 11.45065,21.35265 z m -48.80223,10.31437 c 0,-32.58201 36.49058,-54.27201 67.51771,-40.1325 8.58077,3.9104 8.6421,5.148 0.11108,2.23988 -21.97368,-7.49048 -45.51946,5.51348 -49.99082,27.6091 l -1.03521,5.11561 -3.57498,1.22902 c -1.96621,0.67596 -5.26316,2.34622 -7.32655,3.71171 -4.63379,3.06649 -5.70115,3.10904 -5.70115,0.22718 z m 42.25842,50.3871 c -10.23499,-2.24356 -21.58699,-9.06801 -28.45341,-17.10525 l -4.5418,-5.31622 2.07194,-2.20549 c 1.13957,-1.21302 4.18733,-3.19628 6.77282,-4.40726 l 4.70085,-2.20176 4.53458,4.47053 c 8.06061,7.94674 19.60535,12.23927 30.96496,11.51329 l 5.43422,-0.34731 1.01427,2.58154 c 1.90169,4.84014 2.92124,13.01261 1.71883,13.77769 -1.80254,1.14695 -17.80995,0.64475 -24.21726,-0.75976 z"
+         style="display:inline;fill:#5a2ca0"
+         id="path3415-4-2-2-5-0-3-7-4-4-1-5" />
+      <text
+         sodipodi:linespacing="125%"
+         id="text3557-5-3-7-46-7-3-7"
+         y="519.50671"
+         x="317.95816"
+         style="font-style:normal;font-weight:normal;font-size:97.09867096px;line-height:125%;font-family:Sans;letter-spacing:0px;word-spacing:0px;display:inline;fill:#000000;fill-opacity:1;stroke:none"
+         xml:space="preserve"><tspan
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:97.09867096px;line-height:125%;font-family:FreeEuro;-inkscape-font-specification:'FreeEuro Bold';text-align:start;writing-mode:lr-tb;text-anchor:start"
+           y="519.50671"
+           x="317.95816"
+           id="tspan3559-5-4-1-90-0-2-9"
+           sodipodi:role="line">BZH</tspan></text>
+    </g>
+    <flowRoot
+       xml:space="preserve"
+       id="root-title"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       transform="matrix(2.3469382,0,0,2.3469382,464.13874,-1125.3671)"><flowRegion
+         id="flowRegion4303"><rect
+           id="rect4305"
+           width="679.99994"
+           height="141.42853"
+           x="-154.28572"
+           y="359.50504"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1" /></flowRegion><flowPara
+         id="title"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:87.5px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:center;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1">{title}</flowPara></flowRoot>    <flowRoot
+       xml:space="preserve"
+       id="root-subtitle"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       transform="matrix(1.8523279,0,0,1.8523279,553.97647,-524.84064)"><flowRegion
+         id="flowRegion4303-6"><rect
+           id="rect4305-0"
+           width="852.32806"
+           height="154.51677"
+           x="-239.3591"
+           y="346.41681"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1" /></flowRegion><flowPara
+         id="subtitle"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:62.5px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:center;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1">{subtitle}</flowPara></flowRoot>    <flowRoot
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:173.28189087px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       id="root-version"
+       xml:space="preserve"
+       transform="translate(-2.0185547,164)"><flowRegion
+         id="flowRegion4169"><rect
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:173.28189087px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1"
+           y="501.68909"
+           x="343.32947"
+           height="99.591171"
+           width="1117.3768"
+           id="rect4171" /></flowRegion><flowPara
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:68.75px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:center;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1"
+         id="version">{version}</flowPara></flowRoot>    <flowRoot
+       xml:space="preserve"
+       id="root-date"
+       style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       transform="matrix(4.3320472,0,0,4.3320472,1023.8272,-788.11995)"><flowRegion
+         id="flowRegion4303-6-5"><rect
+           id="rect4305-0-8"
+           width="251.40364"
+           height="23.922138"
+           x="-154.28572"
+           y="359.50504"
+           style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:40px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:start;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1" /></flowRegion><flowPara
+         id="date"
+         style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:15.87009525px;line-height:125%;font-family:Verdana;-inkscape-font-specification:'Verdana, Bold';text-align:center;writing-mode:lr-tb;text-anchor:middle;fill:#000000;fill-opacity:1">{date}</flowPara></flowRoot>  </g>
+</svg>
diff --git a/docs/resources/ebook.css b/docs/resources/ebook.css
new file mode 100644
index 00000000..39f126c2
--- /dev/null
+++ b/docs/resources/ebook.css
@@ -0,0 +1,386 @@
+/* IoT.Bzh theaming */
+
+h1 {
+    color: #330066;
+    border-bottom: 2px solid #330066;
+}
+
+h2 {
+    color: #330066;
+}
+
+h3 {
+    color: #330066;
+}
+
+h4 {
+    color: #330066;
+}
+
+
+/* GENERAL ELEMENTS */
+
+/* clear both */
+
+.clear {
+    clear: both;
+}
+
+.section> :last-child {
+    margin-bottom: 0 !important;
+}
+
+.section> :first-child {
+    margin-top: 0 !important;
+}
+
+
+/* SPECIAL ELEMENTS */
+
+
+/* page break always after element on pdf/print definition */
+
+div.pagebreak {
+    page-break-after: always;
+}
+
+
+/* no page break inside element on pdf/print definition */
+
+div.nopb {
+    page-break-inside: avoid !important;
+    margin: 4px 0 4px 0;
+}
+
+
+/* note blocks */
+
+div.note {
+    background: #FCF8E3 none repeat scroll 0% 0%;
+    color: #8A6D3B;
+    padding: 15px;
+    margin-bottom: 10px;
+    border-bottom: 5px solid #DDD;
+    border-color: #FAEBCC;
+    page-break-inside: avoid;
+}
+
+div.note p {
+    padding-bottom: 0;
+    margin-bottom: 0;
+}
+
+
+/* images, figures and captions */
+
+p img {
+    /* center all images */
+    display: block;
+    margin: 0 auto;
+    padding: 10px 0;
+}
+
+figure {
+    margin: 1.0em 0px;
+    padding: 10px 0;
+    text-align: center;
+    page-break-inside: avoid;
+    display: block;
+}
+
+figure img {
+    display: block;
+    margin: 0 auto;
+}
+
+figcaption {
+    clear: left;
+    margin: 1.0em 0 0 0;
+    text-align: center;
+    font-style: italic;
+    line-height: 1.5em;
+    font-size: 80%;
+    color: #666;
+    display: block;
+}
+
+.page .section p img {
+    margin-top: 10px;
+}
+
+
+/* ul, ol list margin fix */
+
+.page .section ol,
+.page .section ul {
+    margin-bottom: 10px;
+}
+
+
+/* blockquotes */
+
+.page .section blockquote {
+    margin: 0 0 0 5%;
+    font-style: italic;
+}
+
+
+/* PAGE SPECIFIC */
+
+
+/* set summary page to right side of the paper */
+
+.page .toc h1 {
+    page-break-before: right;
+}
+
+.page .section.toc {
+    page-break-inside: always;
+}
+
+/* table headers */
+
+div#README\.md table {
+    margin-top: 30px;
+    font-size: 95%;
+}
+
+div#README\.md table thead {
+    display: none;
+}
+
+
+
+/* CITATION AND IMAGES */
+
+
+/* math image styles */
+
+.page .section p img.svg,
+.page .section p img.png {
+    margin-top: 0px;
+    margin-bottom: -2px;
+}
+
+.page .section p img.math {
+    vertical-align: middle;
+    height: auto;
+    width: auto;
+    margin-top: -4px;
+    max-height: 15px;
+}
+
+.page .section p img.math.line1 {
+    margin-top: -7px;
+    max-height: 19px;
+}
+
+.page .section p img.math.line2 {
+    margin-top: -1px;
+    max-height: 30px;
+}
+
+
+/* credits page */
+
+.page .section ul.pictures {
+    margin-left: -30px;
+}
+
+.page .section ul.pictures li {
+    list-style: outside none none;
+}
+
+.page .section ul.pictures li a {
+    float: left;
+}
+
+.page .section ul.pictures li span {
+    display: block;
+    margin-left: 100px;
+}
+
+
+
+/* sub and super script */
+
+.page .section sub {
+    font-size: 80%;
+    margin-left: 1px;
+}
+
+
+/* citations and references */
+
+.page .section sup {
+    margin-left: -1px;
+    margin-right: 2px;
+    font-size: 80%;
+}
+
+.page .section sup:before {
+    content: " ";
+}
+
+.page .section ul.citations,
+.page .section ul.references {
+    margin-left: -30px;
+}
+
+
+.page .section ul.citations li:nth-child(1) {
+    margin-top: 20px;
+    padding-top: 20px;
+    border-top: 1px solid #BBB;
+}
+
+.page .section ul.citations li,
+.page .section ul.references li {
+    list-style: outside none none;
+}
+
+.page .section ul.citations li {
+    font-size: 80%;
+}
+
+.page .section ul.citations li>span:nth-child(1),
+.page .section ul.references li>span:nth-child(1) {
+    display: block;
+    float: left;
+    text-align: left;
+    width: 70px
+}
+
+.page .section ul.citations li>span:nth-child(1) {
+    width: 50px
+}
+
+.page .section ul.references li div {
+    margin-left: 70px;
+}
+
+.page .section ul.citations li div {
+    margin-left: 50px;
+}
+
+.page .section a[href="#"],
+.page .section a[href="#"]:link,
+.page .section a[href="#"]:visited,
+.page .section a[href="#"]:hover,
+.page .section a[href="#"]:focus {
+    text-decoration: none;
+    color: inherit;
+    cursor: text;
+    font-style: italic;
+}
+
+
+/* self referential footnotes */
+
+.page .section div[type="selfref"] a[href="#"],
+.page .section div[type="selfref"] a[href="#"]:link,
+.page .section div[type="selfref"] a[href="#"]:visited,
+.page .section div[type="selfref"] a[href="#"]:hover,
+.page .section div[type="selfref"] a[href="#"]:focus {
+    font-style: normal;
+}
+
+.page .section div[type="selfref"] span:nth-child(1) {
+    display: none;
+}
+
+
+/* page break always after element on pdf/print definition */
+
+div.page-break {
+    page-break-inside: always;
+}
+
+div.page-break:before {
+    content: ' ';
+}
+
+
+/* no page break inside element on pdf/print definition */
+
+div.nopb {
+    page-break-inside: avoid;
+}
+
+/* justify text */
+p {
+    text-align: justify;
+}
+
+/* page header and footer */
+
+.pdf-footer,
+.pdf-header {
+    margin-top: 20px;
+    color: #aaa;
+}
+
+.pdf-header .header-left {
+    float: left;
+    margin-left: 2em;
+    margin-right: auto;
+}
+
+.pdf-header .header-right {
+    display: table;
+    margin-left: auto;
+    margin-right: 2em;
+}
+
+.pdf-footer .sub {
+    padding-top: 8px;
+    font-size: 70%;
+}
+
+.pdf-header .sub {
+    padding-top: 2px;
+    font-size: 70%;
+}
+
+.pdf-footer {
+    padding-top: 10px;
+    border-top: 1px solid #eee;
+}
+
+.pdf-footer .footer-left {
+    float: left;
+    margin-left: 2em;
+    margin-right: auto;
+}
+
+.pdf-footer .footer-center {
+    display: table;
+    margin-left: auto;
+    margin-right: auto;
+}
+
+.pdf-footer .footer-right {
+    float: right;
+    margin-left: auto;
+    margin-right: 2em;
+}
+
+.pdf-header {
+    padding-bottom: 10px;
+    border-bottom: 1px solid #eee;
+}
+
+.pdf-header .header-pages-count {
+    float: right;
+    text-align: right;
+}
+
+.pdf-header .header-pages-count a,
+.pdf-header .header-pages-count a:visited,
+.pdf-header .header-pages-count a:active,
+.pdf-header .header-pages-count a:focus,
+.pdf-header .header-pages-count a:link {
+    text-decoration: none;
+    color: #aaa;
+    cursor: text;
+}
diff --git a/docs/resources/make_cover.sh b/docs/resources/make_cover.sh
new file mode 100755
index 00000000..13ba4f0c
--- /dev/null
+++ b/docs/resources/make_cover.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+DOCS_DIR=$(cd $(dirname $0)/.. && pwd)
+BOOKFILE=$DOCS_DIR/../book.json
+
+TITLE=$(grep  '"title":' $BOOKFILE | cut -d'"' -f 4)
+SUBTITLE=""
+VERSION="Version $(grep  '"version":' $BOOKFILE | cut -d'"' -f 4)"
+DATE=$(grep  '"published":' $BOOKFILE | cut -d'"' -f 4)
+
+[ -z "$TITLE" ] && { echo "Error TITLE not set!" ; exit 1; }
+[ -z "$VERSION" ] && { echo "Error VERSION not set!" ; exit 1; }
+[ -z "$DATE" ] && { echo "Error DATE not set!" ; exit 1; }
+
+
+cat $(dirname $0)/cover.svg | sed -e "s/{title}/$TITLE/g" \
+    -e "s/font-size:87.5px/font-size:54px/g" \
+    -e "s/{subtitle}/$SUBTITLE/g" \
+    -e "s/{version}/$VERSION/g" \
+    -e "s/{date}/$DATE/g" \
+    > /tmp/cover.svg
+
+# use  imagemagick convert tool  (cover size must be 1800x2360)
+convert -resize "1600x2160!" -border 100 -bordercolor white -background white \
+    -flatten -quality 100 /tmp/cover.svg $DOCS_DIR/cover.jpg
+
+convert -resize "200x262!" $DOCS_DIR/cover.jpg $DOCS_DIR/cover_small.jpg