feat!: drop Mercurial support

[JounQin]

Are there any active Mercurial users using pretty-qucik?

References:

• https://www.perforce.com/blog/vcs/bitbucket-mercurial-support-ending

[SukkaW]

Well, even its website https://www.mercurial-scm.org/ is dead:

See also: https://www.jsdelivr.com/globalping?measurement=upnL0T5zKcE29n8U

[JounQin]

@SukkaW

https://wiki.mercurial-scm.org/

2024-01-11 Mercurial 6.6.2 released! (download)

[azz]

would be nice to know how many hg users we have. is keeping hg support difficult?

[JounQin]

would be nice to know how many hg users we have. is keeping hg support difficult?

I'm wondering that also and the support is not difficult, so I'll keep it as-is for now while keeping this issue open.

The bad part is that I have no knowledge with Mercurial.