Added Mastodon to ecosystem socials links.

Author: carltongibson

djangoproject/templates/aggregator/ecosystem.html

@@ -79,7 +79,7 @@ <h2>Resources</h2>
       &mdash;  A great tutorial you can do in addition to the <a href="/en/dev/intro/tutorial/01/">official tutorial</a>.
     </li>
 
-    <li>Follow Django on Social Media &mdash; <a href="https://bsky.app/profile/djangoproject.com">Bluesky</a>, <a href="https://www.linkedin.com/company/django-software-foundation/">LinkedIn</a>, <a href="https://x.com/djangoproject">Twitter</a></li>
+    <li>Follow Django on Social Media &mdash; <a href="https://bsky.app/profile/djangoproject.com">Bluesky</a>, <a href="https://fosstodon.org/@django">Mastodon</a>, <a href="https://www.linkedin.com/company/django-software-foundation/">LinkedIn</a>, <a href="https://x.com/djangoproject">Twitter</a></li>
   </ul>