Removing obsolete link to developer documentation.

doc/index.html

@@ -62,12 +62,6 @@ manual.</p>
      is used in SSL enabled webserver.
    </dd>
 
-   <dt><a href="Development/">SquirrelMail Development</a></dt>
-   <dd>
-     Want to code on SquirrelMail? Change behaviour or fix bugs? Create your own
-     plugin? See this set of documentation for some pointers.
-   </dd>
-
    <dt>Basic documentation that comes with distribution:</dt>
    <dd>
       <a href="../AUTHORS">AUTHORS</a> - Who's behind all this?<br />