tldr: update to 1.12.0

[Swiddis]

The currrent package is based on an unofficial tldr client that hasn't seen updates in over 3 years, and is no longer fully compatible with tldr's doc format. This commit switches to the official tlrc client which is actively maintained. Both clients fundamentally pull from the content repository for actual content.

I haven't copied a gtldr alias which exists in the original, happy to add it for backwards compatibility if necessary.
upd: Found that was integrating with alternatives, did the same here.

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, x86_64-libc

[Swiddis]

Oh, just found the history that we renamed the binary to gtldr because it conflicted with tealdeer -- will push an update in a sec to do the same alternatives-rename thing with tlrc then.

[Swiddis]

Okay, looked into the clients situation more: the client they say is most feature-complete on their website is the python client (but has less stars than the rust one, gg). When packaged that one tends to be tldr. tlrc is packaged in most package managers as tlrc.

So I guess the morally correct thing to do is make tlrc a new alternative package, and update this one to tldr-py. Need to sleep but will flip this to draft for now and at minimum split the package off, at best also get this package on the official client.

[tranzystorekk]

This package tracks the https://github.com/isacikgoz/tldr project in particular, for tlrc you'll need to open a new-package PR.