[theme] remove categories, language and time range from index

searx/templates/simple/index.html

@@ -7,6 +7,6 @@
 <nav id="linkto_preferences"><a href="{{ url_for('preferences') }}">{{ icon('navicon-round') }}</a></nav>
 <div class="index">
     <div class="title"><h1>searx</h1></div>
-    {% include 'simple/search.html' %}
+    {% include 'simple/simple_search.html' %}
 </div>
 {% endblock %}