[fix] proper src/href url handling

searx/templates/index.html

@@ -4,8 +4,8 @@
     <div class="title"><h1>searx</h1></div>
     {% include 'search.html' %}
     <p class="top_margin">
-        <a href="/about" class="hmarg">{{ _('about') }}</a>
-        <a href="/preferences" class="hmarg">{{ _('preferences') }}</a>
+        <a href="{{ url_for('about') }}" class="hmarg">{{ _('about') }}</a>
+        <a href="{{ url_for('preferences') }}" class="hmarg">{{ _('preferences') }}</a>
     </p>
 </div>
 {% endblock %}