Added support for announcement bar

src/base.html

@@ -224,6 +224,13 @@
       </a>
     {% endif %}
 
+    <!-- Announcement bar -->
+    {% if self.announcement() %}
+      <div class="md-announcement" data-md-component="announcement">
+        {% block announcement %}{% endblock %}
+      </div>
+    {% endif %}
+
     <!-- Application header -->
     {% block header %}
       {% include "partials/header.html" %}