title: Add link to main page on grappelli admin
body: <p>Is there a simple way to add a link back to the main site when using the grappelli admin interface with django?</p>
  
  <p>So when the user goes into the admin interface at </p>
  
  <pre><code>http://myurl/admin/
  </code></pre>
  
  <p>I'd like a link somewhere back to </p>
  
  <pre><code>http://myurl/ 
  </code></pre>
  
  <p>for the main site.</p>
  
  <p>The only way I can see of doing this is to edit the grappelli templates, which feels very hacky for such a simple task.</p>