fix: fix broken slack signup

The heroku app was running in Slacks free tier, which doesn't exist any
more. This change removes the links for now.

Author: gwright

layouts/default.html

@@ -24,7 +24,6 @@
             <li><a href="/">v2 (current)</a></li>
             <li><a href="http://seeclickfix.com" target="_blank">SeeClickFix.com</a></li>
             <li><a href="http://seeclickfix.com/contact_us" target="_blank">Support</a></li>
-            <li><script async defer src="https://seeclickfix-api-slack.herokuapp.com/slackin.js"></script></li>
           </ul>
         </div>
       </div><!-- #header -->
@@ -84,13 +83,6 @@ <h3><a href="#" class="js-expand-btn collapsed">&nbsp;</a><a href="/v2/questions
       <div class="sidebar-module">
         <p>This website is a <a href="https://github.com/SeeClickFix/dev.seeclickfix.com" target="_blank">public GitHub repository</a>. Please help us by forking the project and adding to it.</p>
       </div>
-
-      <div class="sidebar-module">
-        <!-- SCF API Slack badge -->
-        <p>Developers, looking to share ideas or ask questions about the SCF API? Join the Slack channel!<br/><br/>
-        <script async defer src="https://seeclickfix-api-slack.herokuapp.com/slackin.js?large"></script></p>
-      </div>
-
     </div><!-- /sidebar-shell -->
 
     </div><!-- #wrapper -->