[general] further improve immutability of KDE config

feat: add resources directory
feat: update KDE config
refactor: remove unused files

modules/nixos/default.nix

@@ -1,7 +0,0 @@
-# Collection of reusable nixos modules (https://nixos.wiki/wiki/Module)
-# These shouldn't include personal configurations, but much rather stuff that can be shared across multiple configurations
-{
-  # List your module files here
-  # my-module = import ./my-module.nix;
-  desktop = import ./desktop;
-}

modules/nixos/desktop/default.nix

@@ -1,5 +0,0 @@
-{
-  kde = import ./kde.nix;
-  gnome = import ./gnome.nix;
-  cosmic = import ./cosmic.nix;
-}