euscanwww: Adding an about config page

Signed-off-by: volpino <fox91@anche.no>

euscanwww/djeuscan/templates/_base.html

@@ -86,6 +86,7 @@
                     <li>---</li>
                     <li><a href="{% url "api" %}">API</a></li>
                     <li><a href="{% url "feeds" %}">Feeds</a></li>
+                    <li><a href="{% url "config" %}">Server config</a></li>
                     <li><a href="{% url "about" %}">About</a></li>
                   {% endblock %}
                 </ul>