Misc: Add nixfmt-tree and run nix fmt

modules/factory/user.nix

@@ -1,10 +1,12 @@
 { self, ... }: {
   config.flake.factory.user = username: isAdmin: {
     nixos."${username}" =
-      { lib
-      , pkgs
-      , ...
-      }: {
+      {
+        lib,
+        pkgs,
+        ...
+      }:
+      {
         users.users."${username}" = {
           isNormalUser = true;
           home = "/home/${username}";