[perl #135539] Link to prepan should be removed

prepan.org is no longer CPAN related

Author: rspier

docs/www/cpan.html

@@ -23,7 +23,6 @@ <h3>Useful CPAN related sites</h3>
         <li><a href="https://metacpan.org/">metacpan.org</a> - search CPAN modules, distributions and authors</li>
         <li><a href="http://www.cpantesters.org/">cpantesters.org</a> - test reports on CPAN modules</li>
         <li><a href="https://rt.cpan.org/">rt.cpan.org</a> - bug reports/wish list for CPAN modules</li>
-        <li><a href="http://prepan.org/">prepan.org</a> - discuss module ideas and get feedback.
     </ul>
   </div>
   <div class="col-xs-12 col-sm-3">