[fix] docs url mod to prevent http redirect

searx/templates/oscar/base.html

@@ -75,7 +75,7 @@
         <div class="container">
             {% block footer %}
             {% endblock %}
-            <p class="text-muted">{{ _('Powered by') }} <a href="https://asciimoo.github.io/searx">searx</a> - {{ searx_version }} - {{ _('a privacy-respecting, hackable metasearch engine') }}</p>
+            <p class="text-muted">{{ _('Powered by') }} <a href="https://asciimoo.github.io/searx/">searx</a> - {{ searx_version }} - {{ _('a privacy-respecting, hackable metasearch engine') }}</p>
         </div>
     </div>
     <script src="{{ url_for('static', filename='js/jquery-1.11.1.min.js') }}"></script>