Clean up after 36bbc39 renames, fix 404s on bugzilla-file-a-bug
    
    36bbc39 renamed some pages but did not update the references to
    them, and did not uncomment the page-aliases line for the 'how
    to file a bug' page, so attempting to access it by its old name
    (either from an external link or from the table of contents)
    ended in a 404. This should fix everything up, tested locally.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>