add link to facebook profile

Author: tyrasd

_includes/footer.html

@@ -31,6 +31,7 @@
             <a class="block" href="https://x.com/sotm">X&nbsp;<span class="icon twitter"></span></a>
             <a class="block" href="https://www.youtube.com/channel/UCLqJsr_5PfdvDFbgv1qp2aQ">Youtube&nbsp;<span class="icon video"></span></a>
             <a class="block" href="https://t.me/sotm_international">Telegram<span class="icon compass"></span></a>
+            <a class="block" href="https://facebook.com/stateofthemap">Facebook&nbsp;<span class="icon facebook"></span></a>
           </nav>
           <nav class="col3 pad2x">
             <a class="block" href="https://github.com/openstreetmap/stateofthemap-2025">GitHub&nbsp;<span class="icon github"></span></a>