bugs: Create new page about how/where to report Fedora i3 bugs
    
    Closes i3-sig/Fedora-i3-Spin#33.
    
    This commit adds a new page to our docs that explains the trifecta of
    how and where to report bugs related to i3 in Fedora. Three possible
    pathways are explained:
    
    * Report upstream on GitHub
    * Report to Fedora maintainers on RHBZ
    * Report to i3 SIG on Pagure
    
    Signed-off-by: Justin W. Flory (he/him) <git@jwf.io>