docs(index): add seed app link to menu item

Author: Richard John

docs/src/templates/index.html

@@ -130,6 +130,7 @@
                 <li><a href="http://www.youtube.com/user/angularjs">Watch</a></li>
                 <li><a href="tutorial">Tutorial</a></li>
                 <li><a href="http://builtwith.angularjs.org/">Case Studies</a></li>
+                <li><a href="https://github.com/angular/angular-seed">Seed App project template</a></li>
                 <li><a href="misc/faq">FAQ</a></li>
               </ul>
             </li>