make everything more modular + basic kitagawa config using gnome

hosts/nixos-vm/default.nix

@@ -13,8 +13,10 @@ in {
     ../../global-default.nix
     ./hardware-configuration.nix
     "${modules-dir}/nh.nix"
-    "${modules-dir}/plasma-desktop.nix"
+    "${modules-dir}/display-managers/sddm.nix"
+    "${modules-dir}/desktop-environments/plasma6.nix"
     "${modules-dir}/home-manager.nix"
+    "${modules-dir}/zsh.nix"
   ];
 
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
@@ -26,10 +28,6 @@ in {
   virtualisation.virtualbox.guest.enable = true;
   virtualisation.virtualbox.guest.dragAndDrop = true;
 
-  programs.zsh.enable = true;
-  users.defaultUserShell = pkgs.zsh;
-  users.users."grey".shell = pkgs.zsh;
-
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   # programs.mtr.enable = true;