Minor improvements of the HTML *about* page

  <hr />

  <h2>Technical details - How does it work?</h2>

  <p>

    Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,

    inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.

    It provides basic privacy by mixing your queries with searches on other

    platforms without storing search data. Queries are made using a POST request

    on every browser (except chrome*).  Therefore they show up in neither our

    logs, nor your url history.  In case of Chrome* users there is an exception,

    searx uses the search bar to perform GET requests.

    Searx can be added to your browser's search bar; moreover, it can be set as

    the default search engine.

  </p>

  <h2>Why use searx?</h2>

  <ul>

      better.  See more on <a href="https://github.com/asciimoo/searx">github</a>.

    </li>

  </ul>

  <p>

    If you do care about privacy, want to be a conscious user, or otherwise

    believe in digital freedom, make searx your default search engine or run it

    on your own server

  </p>

  <h2 id='add to browser'>Can it be set as the default search engine?</h2>

  <h2>Technical details - How does it work?</h2>

  <p>

    Searx is a <a href="https://en.wikipedia.org/wiki/Metasearch_engine">metasearch engine</a>,

    inspired by the <a href="https://beniz.github.io/seeks/">seeks project</a>.

    It provides basic privacy by mixing your queries with searches on other

    platforms without storing search data. Queries are made using a POST request

    on every browser (except chrome*).  Therefore they show up in neither our

    logs, nor your url history.  In case of Chrome* users there is an exception,

    searx uses the search bar to perform GET requests.

    Searx can be added to your browser's search bar; moreover, it can be set as

    the default search engine.

  </p>

  <h2 id='add to browser'>How to set as the default search engine?</h2>

  <dt>Firefox</dt>

    searx as a search engine on any version of Firefox! (javascript required)

  </dd>

  <h2>How to debug engines?</h2>

  <h2>Where to find anonymous usage statistics of this instance ?</h2>

  <p>

    <a href="{{ url_for('stats') }}">Stats page</a> contains some useful data about the engines used.

  <p>

    Searx appreciates your concern regarding logs, so take the

    code from the <a href="https://github.com/asciimoo/searx">orgin searx projekct</a> and

    code from the <a href="https://github.com/asciimoo/searx">orgin searx project</a> and

    run it yourself!

  </p>

  <p>