remove facebook per creativecommons/vocabulary#350

Author: TimidRobot

themes/vocabulary_theme/templates/layout.html

@@ -166,7 +166,6 @@ <h2>Contact Us</h2>
         <ul>
             <li><a class="icon-replace fa-bluesky" href="https://bsky.app/profile/creativecommons.bsky.social" target="_blank">Bluesky</a></li>
             <li><a class="icon-replace fa-mastodon" href="https://mastodon.social/@creativecommons" target="_blank">Mastodon</a></li>
-            <li><a class="icon-replace fa-facebook" href="https://www.facebook.com/creativecommons" target="_blank">Facebook</a></li>
             <li><a class="icon-replace fa-linkedin" href="https://www.linkedin.com/company/creative-commons/" target="_blank">LinkedIn</a></li>
         </ul>
     </nav>