Remove ruby dependency from website build

docs/templates/shared/_head.html.j2

@@ -0,0 +1,17 @@
+  <head>
+    <script>
+      if ((window.location.host == "stedolan.github.io") && (window.location.protocol != "https:"))
+        window.location.protocol = "https";
+    </script>
+    <meta charset="utf-8">
+    <title>{{headline}}</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <link rel="canonical" href="{{ url }}{{ permalink | replace('/index','') }}" />
+    <link href="https://maxcdn.bootstrapcdn.com/bootswatch/3.3.5/spacelab/bootstrap.min.css" rel="stylesheet" integrity="sha256-j7Dtnd7ZjexEiPNbscbopFn9+Cs0b3TLipKsWAPHZIM= sha512-RFhfi6P8zWMAJrEGU+CPjuxPh3r/UUBGqQ+/o6WKPIVZmQqeOipGotH2ihRULuQ8wsMBoK15TSZqc/7VYWyuIw==" crossorigin="anonymous">
+    <link rel="stylesheet" href="{{ root }}/css/base.css" type="text/css">
+    <!--[if lt IE 9]>
+      <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
+      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
+    <![endif]-->
+  </head>