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>