Add bitwarden F-droid link

[tygoee]

Under Password managers > Bitwarden, F-droid isn't specified, but they host an F-droid repo, and it could be linked there

[offa]

They host it on their own 3rd party repository only unfortunately. This list includes only official F-Droid (or izzy Repo) links.

[tygoee]

Maybe you could mention that like this

• Bitwarden ^{[F-Droid repo]}

[offa]

I'm afraid, but 3rd party repositories aren't accepted (except Izzy, but that's another story). There are some reasons listed here: #302 (comment)

[tygoee]

Okay that makes sense