Rework gitbook, add Clever 4 instruction (#163)

Co-authored-by: sfalexrog <sfalexrog@gmail.com>

* Rework the structure.
* Add Clever 4 assembling instruction.
* Rework setup articles.
* Many additional changes.

docs/clever.css

@@ -7,3 +7,44 @@ section ul li:before {
 	margin-left: -20px;
 	position: absolute;
 }
+
+/* Centered images */
+.book img.center {
+	display: block;
+	margin-left: auto;
+	margin-right: auto;
+}
+
+/* Images with border */
+.book img.border {
+	border: 1px #e9e9e9 solid;
+	border-radius: 5px;
+}
+
+.book.color-theme-2 img.border {
+	border: none;
+	background: #fffffa;
+}
+
+/* Images groups in instructions */
+.book .image-group {
+	display: flex;
+	justify-content: center;
+	flex-wrap: wrap;
+}
+
+.book .image-group img {
+	align-self: center;
+	margin: 0 10px;
+	width: 300px;
+	margin-bottom: 0.85em;
+}
+
+/* Main Clever image */
+.book img.bigclever {
+	margin-bottom: -80px;
+}
+.book.color-theme-2 img.bigclever {
+	/* change image for black background */
+	content:url(assets/clever4-front-black-large.png);
+}

docs/clever.js

@@ -0,0 +1,57 @@
+// show link to the latest clever firmware
+gitbook.events.bind('page.change', function() {
+	if (!document.querySelector('a.latest-firmware')) return;
+
+	fetch('https://api.github.com/repos/CopterExpress/Firmware/releases').then(function (res) {
+		return res.json();
+	}).then(function (data) {
+		// look for stable release
+		let stable;
+		for (let release of data) {
+			let clever = release.name.indexOf('clever') != -1;
+			if (clever && !release.prerelease && !release.draft) {
+				stable = release;
+				break;
+			}
+		}
+
+		let el;
+		// let el = document.querySelector('#download-latest-release');
+		// el.innerHTML = stable.name;
+		// el.href = stable.html_url;
+		// document.querySelector('#release').style.display = 'block';
+		for (let asset of stable.assets) {
+			if (asset.name == 'px4fmu-v4_default.px4') {
+				el = document.querySelector('a.latest-firmware.v4');
+			} else if (asset.name == 'px4fmu-v2_lpe.px4') {
+				el = document.querySelector('a.latest-firmware.v2');
+			}
+			if (el) {
+				el.href = asset.browser_download_url;
+				el.innerHTML = stable.name;
+			}
+		}
+	});
+});
+
+// show link to latest raspberry image
+gitbook.events.bind('page.change', function() {
+	var el = document.querySelector('a.latest-image');
+	if (el.length) return;
+
+	// get latest release from GitHub
+	fetch('https://api.github.com/repos/CopterExpress/clever/releases').then(function(res) {
+		return res.json();
+	}).then(function(data) {
+		// look for stable release
+		let stable;
+		for (let release of data) {
+			if (!release.prerelease && !release.draft) {
+				stable = release;
+				break;
+			}
+		}
+		el.innerHTML = stable.name;
+		el.href = stable.assets[0].browser_download_url;
+	});
+});