counter: don't display info boxes and navigation menu

This will lighten the pages and make the functionality directly
accessible without ever scrolling the header garbage that is never
needed on those pages.

core/templates/core/base.jinja

@@ -126,17 +126,19 @@
         </header>
 
         <div id="info_boxes">
-            {% set sith = get_sith() %}
-            {% if sith.alert_msg %}
-            <div id="alert_box">
-                {{ sith.alert_msg|markdown }}
-            </div>
-            {% endif %}
-            {% if sith.info_msg %}
-            <div id="info_box">
-                {{ sith.info_msg|markdown }}
-            </div>
-            {% endif %}
+            {% block info_boxes %}
+                {% set sith = get_sith() %}
+                {% if sith.alert_msg %}
+                <div id="alert_box">
+                    {{ sith.alert_msg|markdown }}
+                </div>
+                {% endif %}
+                {% if sith.info_msg %}
+                <div id="info_box">
+                    {{ sith.info_msg|markdown }}
+                </div>
+                {% endif %}
+            {% endblock %}
         </div>
 
         {% else %}{# if not popup #}