Typos and copy mod_mono.conf to httpd directory

At the end of the script, mod_mono.conf will be moved to
/etc/httpd/conf.d/ (as 00-mod_mono.conf, to get it loaded first), as in
the default Apache configuration this directory is automatically parsed
Removed mod_mono from mono install

mod_mono is now configured in its own script, there's no need to keep it
here