Add count of live services to organisation list

This is useful information that we might as well return now we have it.

app/templates/views/organisations/index.html

@@ -33,6 +33,10 @@
               {% for org in organisations %}
                 <li class="browse-list-item">
                   <a href="{{ url_for('main.organisation_dashboard', org_id=org.id) }}" class="browse-list-link">{{ org.name }}</a>
+                  <p class="browse-list-hint">
+                    {{ org.count_of_live_services }}
+                    live service{% if org.count_of_live_services != 1 %}s{% endif %}
+                  </p>
                   {% if not org.active %}
                     <span class="table-field-status-default heading-medium">- archived</span>
                   {% endif %}