Refactor back to a more modular configuration

modules/nixos/desktop/thunar.nix

@@ -0,0 +1,27 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.nixosModules.desktop.thunar;
+in
+{
+  options.nixosModules.desktop.thunar.enable = mkEnableOption "Enable thunar";
+
+  config = mkIf cfg.enable {
+    programs.thunar = {
+      enable = true;
+
+      plugins = with pkgs.xfce; [
+        thunar-archive-plugin
+      ];
+    };
+
+    environment.systemPackages = with pkgs; [ xfce.tumbler ];
+  };
+}