add nh over nixos-rebuild alias

defaults/shell.nix

@@ -28,6 +28,8 @@ in
           compsize
 
           ffmpeg
+
+          nh
         ]
         ++ (
           if config.nixowos.nvidia.enable then
@@ -51,8 +53,6 @@ in
     environment.shellAliases = {
       # make nix-shell preserve the user's $SHELL
       nix-shell = /* sh */ ''nix-shell --command "export SHELL=$SHELL; $SHELL"'';
-
-      nixos-rebuild = /* sh */ "nixos-rebuild --ask-sudo-password";
     };
 
     environment.systemPackages = lib.mkIf config.nixowos.allowAddingPackages cfg.extraPackages;