Improve menu + add about and maps pages

www/templates/maposmatic/about.html

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+{% extends "maposmatic/base.html" %}
+
+{% block menu-about %}
+class="activelink"
+{% endblock %}
+
+{% block page %}
+<h1>About</h1>
+
+{% endblock %}

www/templates/maposmatic/all_maps.html

@@ -0,0 +1,10 @@
+{% extends "maposmatic/base.html" %}
+
+{% block menu-maps %}
+class="activelink"
+{% endblock %}
+
+{% block page %}
+<h1>Maps</h1>
+
+{% endblock %}