redhat: rhdocs: Remove the documentation subtree from the kernel
Upstream Status: RHEL-only
JIRA: INTERNAL
As the rhdocs git-subtree has been in a broken state and essentially unmaintained for a long time, let us remove it from the kernel repository, and replace it with a direct link to the CentOS docs project && the rendered docs.
Furthermore, cleanup the makefile target and .get_maintainer.conf
Signed-off-by: Derek Barbosa debarbos@redhat.com