Remove link to django-developers from the footer

Author: LilyFirefly

trac-env/templates/site_footer.html

@@ -42,7 +42,6 @@ <h2>Follow Us</h2>
             <li><a href="https://twitter.com/djangoproject">Twitter</a></li>
             <li><a href="https://fosstodon.org/@django" rel="me">Fediverse (Mastodon)</a></li>
             <li><a href="https://www.djangoproject.com/rss/weblog/">News RSS</a></li>
-            <li><a href="https://groups.google.com/forum/#!forum/django-users">Django Users Mailing List</a></li>
           </ul>
         </div>