move grub config to module

hosts/desktop1/configuration.nix

@@ -23,11 +23,6 @@
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.efiSupport = true;
-  boot.loader.grub.device = "nodev";
-  boot.loader.efi.canTouchEfiVariables = true;
-
   boot.loader.grub.extraEntries = ''
     menuentry "Archlinux" {
       insmod part_gpt