GTK themes are not applied correctly about nix

[nikololiahim]

I see, thank you! Then a temporary workaround would be to just pin the flake's git
rev and switch back to master when the GTK changes hit the unstable nixpkgs branch.

[isabelroses]

The change to "Dark" -> "dark" and etc was made in regards to the upstream catppuccin/gtk. But nixos/nixpkgs still has not received these changes the maintainer has been contacted and hopefully this will be fixed soon.

[isabelroses]

The situation is a lot more complex then we first though. catppuccin/gtk uses a pinned commit submodule but nixos/nixpkgs uses a colloid release to build the catppuccin theme so even if we update catppuccin/gtk on nixpkgs the fix won't work so we are just going to roll back the change.

[getchoo]

based on the comments in #147 and #159 being merged, this should be fixed. feel free to re-open if there are any more issues :)