switch from alejandra -> nixpkgs-fmt

alejandra has someone questionable choices for formatting that no one would apply to there code if they would format manually.
nixpkgs-fmt seems to produce more readable results.

flake-parts/formatting.nix

@@ -1,7 +1,6 @@
-{
-  self,
-  inputs,
-  ...
+{ self
+, inputs
+, ...
 }: {
   imports = [
     inputs.treefmt-nix.flakeModule
@@ -10,7 +9,7 @@
     treefmt.projectRootFile = "flake.nix";
     treefmt.flakeCheck = true;
     treefmt.flakeFormatter = true;
-    treefmt.programs.alejandra.enable = true;
+    treefmt.programs.nixpkgs-fmt.enable = true;
     treefmt.programs.shellcheck.enable = true;
   };
 }

flake.nix

@@ -12,11 +12,10 @@
   };
 
   outputs = inputs @ { flake-parts, ... }:
-    flake-parts.lib.mkFlake {inherit inputs;} ({
-      lib,
-      config,
-      self,
-      ...
+    flake-parts.lib.mkFlake { inherit inputs; } ({ lib
+                                                 , config
+                                                 , self
+                                                 , ...
                                                  }: {
       systems = lib.systems.flakeExposed;
       imports = [

hidden-announce.nix

@@ -1,8 +1,7 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
+{ config
+, lib
+, pkgs
+, ...
 }: {
   options.hidden-announce = {
     enable = lib.mkEnableOption "hidden-announce";

installer.nix

@@ -1,8 +1,7 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
+{ config
+, lib
+, pkgs
+, ...
 }: {
   systemd.tmpfiles.rules = [
     "d /var/shared 0777 root root - -"

pkgs/go-ssb/default.nix

@@ -1,7 +1,7 @@
-{
-  lib,
-  buildGoModule,
-  fetchFromGitHub,
+{ lib
+, buildGoModule
+, fetchFromGitHub
+,
 }:
 buildGoModule rec {
   pname = "go-ssb";

templates/python-project/default.nix

@@ -1,11 +1,11 @@
-{
-  pkgs ? import <nixpkgs> {},
-
-  lib ? pkgs.lib,
-  python3 ? pkgs.python3,
-  ruff ? pkgs.ruff,
-  runCommand ? pkgs.runCommand,
-}: let
+{ pkgs ? import <nixpkgs> { }
+, lib ? pkgs.lib
+, python3 ? pkgs.python3
+, ruff ? pkgs.ruff
+, runCommand ? pkgs.runCommand
+,
+}:
+let
   pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);
   name = pyproject.project.name;
 

templates/python-project/flake-module.nix

@@ -1,9 +1,11 @@
 {
-  perSystem = {pkgs, ...}: let
+  perSystem = { pkgs, ... }:
+    let
       pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);
       name = pyproject.project.name;
       package = pkgs.callPackage ./default.nix { };
-  in {
+    in
+    {
       # packages.${name} = package;
       checks.python-template = package.tests.check;
     };

templates/python-project/shell.nix

@@ -1,7 +1,8 @@
-{
-  pkgs ? import <nixpkgs> {},
-  system ? builtins.currentSystem,
-}: let
+{ pkgs ? import <nixpkgs> { }
+, system ? builtins.currentSystem
+,
+}:
+let
   lib = pkgs.lib;
   python3 = pkgs.python3;
   package = import ./default.nix {