Fix Github link.

Author: rstacruz

index.html

@@ -55,7 +55,7 @@ <h1><a href='.'>Flatdoc</a></h1>
   <div class='content-root'>
     <div class='menubar'>
       <div class='section'>
-        <a class='big button' href='https://github.com/rstacruz/backbone-patterns'>View in GitHub</a>
+        <a class='big button' href='https://github.com/rstacruz/flatdoc' target='_blank'>View in GitHub</a>
       </div>
       <div class='menu section' role='flatdoc-menu'></div>
     </div>