Remove no longer needed content

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/html/index.html

@@ -189,13 +189,10 @@
 
 </div>
 
-<h2>{% trans "Summaries" %}</h2>
-
 <div class="tabs" id="main-tabs">
 
 <ul>
 <li><a href="#changes">{% trans "History" %}</a></li>
-<li><a href="{% url 'view_activity' %}">{% trans "Activity" %}</a></li>
 </ul>
 
 <div id="changes">