removing default global kernel and moving desktop.nix to zfs unstable and linuxPackages_zen

Im testing this to allow jeeves to be stable and desktops stay on the latest kernel

common/optional/desktop.nix

@@ -1,4 +1,9 @@
+{ lib, pkgs, ... }:
 {
+  boot = {
+    kernelPackages = lib.mkDefault pkgs.linuxPackages_zen;
+    zfs.package = pkgs.zfs_unstable;
+  };
   services = {
     desktopManager.plasma6.enable = true;
     xserver = {