Refactor back to a more modular configuration

modules/home-manager/desktop/gtk.nix

@@ -0,0 +1,34 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.homeManagerModules.desktop.gtk;
+in
+{
+  options.homeManagerModules.desktop.gtk.enable = mkEnableOption "Enable gtk";
+
+  config = mkIf cfg.enable {
+    gtk = with pkgs; {
+      enable = true;
+
+      theme = {
+        name = "Arc-Dark";
+        package = arc-theme;
+      };
+
+      iconTheme = {
+        name = "Arc";
+        package = arc-icon-theme;
+      };
+
+      gtk3.extraConfig.gtk-enable-animations = false;
+      gtk4.extraConfig.gtk-enable-animations = false;
+    };
+  };
+}