qa -> master

• Move source repo to footer with partials overriding
• Removing legend for C8 update advisories

Not so important to have the repo link on the header, as the important thing here is that pages will now show an edit icon that will redirect to the corresponding file. This edit will tell the user to fork the repo and then propose a MR.

docs/stylesheets/extra.css

@@ -162,3 +162,22 @@
   color: #00ff00;
   font-weight: bold;
 }
+
+
+/* Float source link on custom footer */
+
+.md-footer-nav__source{
+  padding: 0 1em 0 1em;
+  /* As for next/previous section */
+  margin-right: auto;
+  margin-left: auto;
+  max-width: 61rem;
+}
+
+.md-footer-nav__source a{
+  float: right;
+}
+
+.md-footer-nav__source a .md-source__repository{
+  max-width: 100%;
+}