[enh] about page update

searx/templates/about.html

     <br />It tries to provide basic privacy by mixing your queries with those from others while avoiding storing search data. For all browsers (except chrom*) queries are made using a POST request. Thus they don't show up in our logs, nor in your url history. For Chrom* users there is an exception, searx is used from the search bar, it issues GET requests.
     <br />You can add it to your browsers search bar and even make it your default search engine.
     </p>
-    <p>Please add more engines to this list, pull requests are welcome!</p>
+    <h2>What makes searx different</h2>
+    <ul>
+        <li>No ads - searx is Free Software (free-as-in-freedom), funded by your donations</li>
+        <li>Privacy - tries to minimalize the digital footprint of the searches</li>
+        <li>Optionally self hosted - see the <a href="#faq">FAQ</a></li>
+        <li>Easy to add new engines/categories</li>
+    </ul>
 
 <h2>Engines</h2>
 
         {% endfor %}
     </ul>
 {% endfor %}
+<p>Please add more engines to this list, pull requests are welcome!</p>
 
-<h2><a href="https://github.com/asciimoo/searx/wiki/Searx-instances">Running instances</a></h2>
+<h2><a href="https://github.com/asciimoo/searx/wiki/Searx-instances">Running public instances</a></h2>
 
-<h2>FAQ</h2>
+<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 for your friends! decentralize!</p>
 <h3>Firefox engines plz?</h3>