Experiment with PDF generation

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

docs/extras/css/icons.css

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+.kubernetes {
+    color: #3970e4;
+  }
+.docker {
+    color: #0db7ed;
+}
+.discord {
+    color: #7289da;
+}

docs/extras/javascript/feedback.js

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+var feedback = document.forms.feedback
+feedback.addEventListener("submit", function(ev) {
+  ev.preventDefault()
+
+  /* Retrieve page and feedback value */
+  var page = document.location.pathname
+  var data = ev.submitter.getAttribute("data-md-value")
+
+  /* Send feedback value */
+  console.log(page, data)
+})

docs/extras/javascript/plausible.js

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+<script>window.plausible = window.plausible || function() { (window.plausible.q = window.plausible.q || []).push(arguments) }</script>

docs/extras/javascript/rightmessage.js

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+<!-- RightMessage -->
+<script type="text/javascript"> 
+  (function(p, a, n, d, o, b, c) {
+      o = n.createElement('script'); o.type = 'text/javascript'; o.async = true; o.src = 'https://tb.rightmessage.com/'+p+'.js';
+      b = n.getElementsByTagName('script')[0]; d = function(h, u, i) { var c = n.createElement('style'); c.id = 'rmcloak'+i;
+          c.type = 'text/css'; c.appendChild(n.createTextNode('.rmcloak'+h+'{visibility:hidden}.rmcloak'+u+'{display:none}'));
+          b.parentNode.insertBefore(c, b); return c; }; c = d('', '-hidden', ''); d('-stay-invisible', '-stay-hidden', '-stay');
+      setTimeout(o.onerror = function() { c.parentNode && c.parentNode.removeChild(c); }, a); b.parentNode.insertBefore(o, b);
+  })('1802694484', 20000, document);
+  </script>

docs/extras/javascript/tablesort.js

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+document$.subscribe(function() {
+  var tables = document.querySelectorAll("article table:not([class])")
+  tables.forEach(function(table) {
+    new Tablesort(table)
+  })
+})

docs/extras/javascript/widgetbot.js

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+// Display for 10 seconds + custom avatar
+// crate.notify({
+//   content: 'Need a 🤚? Hot, sweaty geeks are waiting to chat to you! Click 👇',
+//   timeout: 5000,
+//   avatar: 'https://avatars2.githubusercontent.com/u/1524686?s=400&v=4'
+// })
+
+
+// This file should _not_ be routinely included, it's here to make tweaking of the widgetbot settings
+// faster, since making changes doesn't require restarting mkdocs serve
+<script src="https://cdn.jsdelivr.net/npm/@widgetbot/crate@3"></script>
+
+<script>
+  const devbutton = new Crate({
+  server: '396055506072109067',
+  channel: '456689991326760973' // Cookbook channel
+  color: '#000',
+  indicator: false,
+  notifications: true,
+  indicator: true,
+  timeout: 5000,
+  glyph: 'https://avatars2.githubusercontent.com/u/1524686?s=400&v=4'
+  })
+
+  devbutton.notify('Hello __world__\n```js\n// This is Sync!\n```')
+</script>
+