[enh] about page update

searx/static/css/style.css

 .row p { padding: 0 10px; max-width: 700px; }
 .row h3,ul { margin: 4px 8px;}
 
-.top_margin { margin-top: 40px; }
+.hmarg { margin: 0 20px; }
+
+.top_margin { margin-top: 60px; }
 
 .center { text-align: center; }
 

searx/templates/about.html

     </ul>
 {% endfor %}
 
+<h2><a href="https://github.com/asciimoo/searx/wiki/Searx-instances">Running instances</a></h2>
+
 <h2>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>

searx/templates/index.html

     <h1 class="title">searx</h1>
     {% include 'search.html' %}
     <p class="top_margin">
-    <a href="/about">about</a>
+        <a href="/about" class="hmarg">about</a>
     </p>
 </div>
 {% endblock %}