Removes announcement and fixes grammar

overrides/main.html

@@ -1,12 +1,5 @@
 {% extends "base.html" %}
 
-{% block header %}
-    {{ super() }}
-    <div style="color: red; text-align: center; padding: 10px; font-size: 20px;">
-        <strong>Announcement:</strong> This documentation is still in progress.
-    </div>
-{% endblock %}
-
 {% block footer %}
     {# Empty block to override the footer #}
 {% endblock %}