Add new tickets for the next release

Add new tickets for the F39 release:

Ticket names for new milestone "F39 branch from rawhide!:

• Branch release notes for upcoming release
• Branch guides for upcoming release

Ticket names for new milestone "F39 Beta":

• Update guides for upcoming release

Ticket names for new milestone "F39 Final Release":

• Add new release docs to front page
• Publish updated guides and release notes on docs.fp.o
• Add new tickets for the next release