Move the generic WHATWG parts of wiki/FAQ to whatwg.org/faq

This was produced starting from the HTML output of
https://wiki.whatwg.org/wiki/FAQ and cleaning it up to match the style
of /working-mode and /code-of-conduct. New IDs were minted, but no
changes to the text content was made, verified using
https://github.com/foolip/epubbase/blob/master/worddiff.py.

Some minimal amount of style is carried over or invented to make it not
much worse than the old FAQ.

src/.htaccess

@@ -84,7 +84,6 @@ redirect permanent /x https://xhr.spec.whatwg.org/
 redirect permanent /xhr https://xhr.spec.whatwg.org/
 
 redirect permanent /newbug https://github.com/whatwg/html/issues/new
-redirect permanent /faq https://wiki.whatwg.org/wiki/FAQ
 
 # redirect permanent /) https://whatwg.org/
 redirect permanent /mailing-list) https://whatwg.org/mailing-list

src/code-of-conduct

@@ -16,6 +16,7 @@
    <li><a href="https://spec.whatwg.org/">Standards</a></li>
    <li><a href="/working-mode">Working Mode</a></li>
    <li class="this"><strong>Code of Conduct</strong></li>
+   <li><a href="/faq">FAQ</a></li>
   </ul>
 
   <h2>Code of Conduct</h2>