Revert "Move some bootloader stuff into common instead."

This reverts commit 3ded53b18f.

nodes/hosts/common/system/bootloader.nix

@@ -1,11 +0,0 @@
-{ pkgs, config, ... }: {
-  boot = {
-    loader = {
-      systemd-boot.enable = true;
-      efi.canTouchEfiVariables = true;
-    };
-    kernelPackages = pkgs.linuxPackages_xanmod_stable;
-    extraModulePackages = with config.boot.kernelPackages; [ xone ];
-  };
-}
-