Move some the examples, technical details, and tutorial-style stuff into

its own place, somewhat like we did with mod_ssl and others. The main
module reference document should just be a module reference document,
and nothing more.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@157838 13f79535-47bb-0310-9956-ffa450edef68