As discussed on docs@httpd, remove the FAQ and replace it with the contents

As discussed on docs@httpd, remove the FAQ and replace it with the contents
of the old support.xml and a pointer to the wiki.

Of possible interest: I've also removed the link to the professional support
database, since it was returning error 500 for some time and nobody
seemed to care.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@535248 13f79535-47bb-0310-9956-ffa450edef68