about: update source code URL to github/ffnord

lib/about.js

@@ -28,8 +28,8 @@ define(function () {
       s += "https://www.gnu.org/licenses/</a>.</p>"
 
       s += "<p>You may find the source code at "
-      s += "<a href=\"http://draic.info/meshviewer\">"
-      s += "http://draic.info/meshviewer</a>."
+      s += "<a href=\"https://github.com/ffnord/meshviewer\">"
+      s += "https://github.com/ffnord/meshviewer</a>."
 
       el.innerHTML = s
     }