[Pkg-privacy-maintainers] Bug#965055: Incorrect manpage reference to crypto key: Will be fixed in new release

[Ulrike Uhlig]

I addressed this issue by rewriting the manpage to make it more
up-to-date and reflect the features of the current version of onionshare.

See
https://salsa.debian.org/pkg-privacy-team/onionshare/-/compare/a97caf90bf600175591c22d5695a62b69d9c8725...6e950f3ad7201836e8dab6080990f94b9384b9d9
for details.