[enh] faq updates

searx/templates/about.html

 <h2 id="faq">FAQ</h2>
 <h3>Trust</h3>
 <p>It's ok if you don't trust us regarding the logs, <a href="https://github.com/asciimoo/searx">take the code</a> and run it yourself! decentralize!</p>
-<h3>Firefox engines plz?</h3>
-<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '/opensearch.xml')">
-	Install</a> searx as a search engine on any version of Firefox!</p>
+<h3>How to add to firefox?</h3>
+<p><a href="#" onclick="window.external.AddSearchProvider(window.location.protocol + '//' + window.location.host + '/opensearch.xml')">Install</a> searx as a search engine on any version of Firefox! (javascript required)</p>
+<h2 id="faq">Developer FAQ</h2>
 <h3>New engines?</h3>
 <p><ul>
     <li>Edit your engines.cfg, see <a href="https://raw.github.com/asciimoo/searx/master/engines.cfg_sample">sample config</a></li>
     <li>Create your custom engine module, check the <a href="https://github.com/asciimoo/searx/blob/master/examples/basic_engine.py">example engine</a></li>
-    </ul>Don't forget to restart searx after config edit.
+    </ul>Don't forget to restart searx after config edit!
 </p>
 <h3>WSGI support?</h3>
 <p><a href="https://about.okhin.fr/posts/Searx/">Okhin wrote</a> a great and detailed article about the setup.</p>