Remove reference to working group point of contact

Author: SmallRye CI

_includes/working-group-band.html

@@ -3,7 +3,7 @@
     <div class="width-12-12 width-12-12-m">
       <p class="mt-0 lead">
         Joining a working group is a great way to get involved and help shape the future of Quarkus. 
-        If you are interested in joining a working group, please reach out to the point of contact on GitHub or Zulip.
+        If you are interested in joining a working group, please check its board and look at the <em>readme</em> (under <em>Project details</em>).
       </p>
     </div>