Archive this repo

[ViralBShah]

Let's archive this repo.

@timholy I'm happy to help with some cleanup across JuliaGraphics repos (but will need to be added to JuliaGraphics as owner)

[timholy]

@tknopp OK with you?

@ViralBShah thanks for the kind offer! Invite sent.

[tknopp]

ok with me!

[ViralBShah]

Unarchived - since the package worked fine in 1.11, and can work with minor modifications on 1.12. We still have a clear warning asking users to use Gtk4.jl in the README - but this allows for small maintenance.

cc @KristofferC