templates: link to images view from the dashboard

Add link to image count in dashboard to open images view.

ogcp/templates/dashboard.html

@@ -27,7 +27,7 @@
           <td>{{ server.time_dict.boot }}</td>
           <td>{{ server.time_dict.start }}</td>
           <td>{{ server.clients | length }}</td>
-          <td>{{ server.images | length }}</td>
+          <td><a href="{{ url_for('images') }}">{{ server.images | length }}</a></td>
           <td>
             {% set disk = server.disk %}
             {% if disk['total'] != 0 %}