Remove old rewriteguide and link to new version.

We've been living with duplicate content here for too long. The new
guide was never finished, but it has some good content.

This orphens a Korean translation. I'm leaving it there for the moment.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@636028 13f79535-47bb-0310-9956-ffa450edef68