Added a link from a fake image to the root of the website.

The fake image is associated with a css class that spans over
the logo.  So it looks like the logo itself is clickable.

ORGWEBPAGE/index.org

@@ -14,6 +14,8 @@ planning, and authoring with a fast and effective plain-text
 system.
 
 #+begin_html
+  <!-- Add a fake image and use a CSS class to make it linkable -->
+  <a href="/"><img src="http://orgmode.org/img/spacer.gif" class="logo-link" /></a>
   <table width="100%">
   <tr>
   <td rowspan="2">