Revert "Merge pull request #154 from ember-learn/on-this-page-prefix"

This reverts commit 91c5602, reversing
changes made to 00a281e.

Author: mansona

addon/components/on-this-page.hbs

@@ -5,7 +5,7 @@
     <ul>
       {{#each @toc as |toc|}}
         <li>
-          <a href="#{{this.headerPrefix}}{{toc.id}}">{{toc.text}}</a>
+          <a href="#{{toc.id}}">{{toc.text}}</a>
         </li>
       {{/each}}
     </ul>