Link to the Prometheus docs from the welcome page.

templates/front/welcome.html

@@ -413,10 +413,10 @@
         </div>
 
         <div class="col-lg-2 col-md-3 col-sm-4 col-xs-6">
-            <div class="integration">
+            <a href="{% url 'hc-serve-doc' 'configuring_prometheus' %}" class="integration">
                 <img src="{% static 'img/integrations/prometheus.png' %}" class="icon" alt="" />
                 <h3>Prometheus<br><small>Event Monitoring</small></h3>
-            </div>
+            </a>
         </div>
 
         {% if enable_pushbullet %}