🖌️ Goodbye Stylix

- Added theming to Btop
- Added theming to Nvim and removed bufferline plugin
- Added mode to theme.nix to change from light theme to dark theme
- Replaced Starship theme with Catppuccin starship theme
- Added QT platformtheme ENV
- Moved wallpapers into wallpaper dir
- Replaced image of desktop1 with more up to date one

common.nix

@@ -29,5 +29,4 @@ rec {
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.version = "24.11";
-  terminal = default.terminal; # TODO remove
 }