fix paths + add missing youtube include

Author: escherize

_config.yml

@@ -75,4 +75,4 @@ defaults:
     values:
       layout: new-docs
       version: "latest"
-      permalink: "/latest/:path/"
+      permalink: "/:path/"

_includes/youtube.html

@@ -0,0 +1,23 @@
+{% if include.width != '' %}
+<div style='width: {{include.width}}; margin-bottom: 2em;'>
+    {% else %}
+    <div>
+        {% endif %}
+        <div class="youtube-container"
+	     style="position: relative;
+                    width: 100%;
+                    height: 0;
+                    padding-bottom: 56.25%">
+
+          <iframe class="youtube-video"
+		  style="position: absolute;
+                         top: 0;
+                         left: 0;
+                         width: 100%;
+                         height: 100%;
+                         border: 0"
+		  allowfullscreen
+		  src="https://www.youtube.com/embed/{{include.id}}">
+	  </iframe>
+        </div>
+    </div>