[desktop] Refactor into multiple components

roles/desktop/programs.nix

@@ -0,0 +1,16 @@
+{ lib, config, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    environment.systemPackages = with pkgs; [
+      brightnessctl
+      emacs-nox
+    ];
+
+    programs.dconf.enable = true;
+    services.gnome.gnome-keyring.enable = true;
+    programs.kdeconnect.enable = true;
+  };
+}