Updated the index to link to repo

index.html

@@ -21,6 +21,8 @@
 
       <p>Made using an .svg <img src="svgs/resource-bookmark.svg" /> imported into <a href="#">https://glyphter.com/</a>.
 
+
+      <p>Visit <a href="https://github.com/flukeout/mozmaker-icon-font">Github repo</a> to contribute and grab the source Sketch file.</p>
     </div>