nixos-config/modules/home/settings/nix/default.nix

{ unstable, lib, pkgs, ... }:
{
  nix = {  
    package = lib.mkForce pkgs.nix;
    registry.unstable.flake = unstable;
    settings.experimental-features = [
      "nix-command"
      "flakes"
    ];
  };
}