Update index.html to include a "fork me on GitHub" ribbon (#167)

* Update index.html

issue #141 - added "Fork me on GitHub" ribbon

* Added "Fork me on Github" ribbon to compare.html

Author: furpuddle

site/static/compare.html

@@ -21,6 +21,9 @@ <h3>Commits</h3>
         </div>
     </div>
     <div id="as-of"></div>
+    <a href="https://github.com/rust-lang-nursery/rustc-perf">
+        <img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/38ef81f8aca64bb9a64448d0d70f1308ef5341ab/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6461726b626c75655f3132313632312e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png">
+    </a>
 </body>
     <script src="libs/fetch.js"></script>
     <script src="shared.js"></script>

site/static/index.html

@@ -22,6 +22,9 @@
         </div>
     </div>
     <div id="as-of"></div>
+    <a href="https://github.com/rust-lang-nursery/rustc-perf">
+        <img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/38ef81f8aca64bb9a64448d0d70f1308ef5341ab/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6461726b626c75655f3132313632312e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png">
+    </a>
 </body>
     <script src="libs/highcharts.js"></script>
     <script src="libs/fetch.js"></script>