Comment out the fork banner related code.

Prevents the image overlays on small screens until the `fork banner`
related issues (#22 & #45) are resolved.

_layouts/default.html

@@ -24,6 +24,7 @@
       {% endif %}
     </article>
   </div>
+<!--
   <div class="forkit-curtain">
     <div class="close-button"></div>
       <h2>Yeoman Repositories</h2>
@@ -49,11 +50,10 @@ <h2>Generators</h2>
         <p>Rails-like generator system for Yeoman that provide scaffolding for your apps</p>
       </section>
   </div>
-  <!--
   <a class="forkit" data-text="Fork me on GitHub" data-text-detached="Drag down >" href="https://github.com/yeoman">
     <img class="forkit-img" src="https://a248.e.akamai.net/camo.github.com/e6bef7a091f5f3138b8cd40bc3e114258dd68ddf/687474703a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f7265645f6161303030302e706e67" alt="Fork me on GitHub">
   </a>
-  -->
+-->
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