Enable Zendesk integration.

templates/front/channels.html

@@ -279,7 +279,7 @@
 
             <a href="{% url 'hc-add-opsgenie' %}" class="btn btn-primary">Add Integration</a>
         </li>
-        {% if enable_zendesk and false %}
+        {% if enable_zendesk %}
         <li>
             <img src="{% static 'img/integrations/zendesk.png' %}"
                  class="icon" alt="Discord icon" />