get rid of flake-utils

flake.nix

@@ -4,24 +4,14 @@
     trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
     extra-experimental-features = "nix-command flakes";
   };
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; # TODO 24.11
-    flake-utils.url = "github:numtide/flake-utils";
-  };
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; # TODO 24.11
+
   outputs =
-    {
-      self,
-      nixpkgs,
-      flake-utils,
-      ...
-    }:
-    flake-utils.lib.eachDefaultSystem (
-      system:
-      let
-        pkgs = import nixpkgs { inherit system; };
-      in
-      {
-        devShells.default = pkgs.mkShellNoCC {
+    { self, nixpkgs }:
+    let
+      mkShell =
+        pkgs:
+        pkgs.mkShellNoCC {
           LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
           packages = with pkgs; [
             hugo
@@ -31,8 +21,9 @@
             dart-sass
           ];
         };
-
-        formatter = pkgs.nixfmt-rfc-style;
-      }
-    );
+    in
+    {
+      devShells.x86_64-linux.default = mkShell (import nixpkgs { system = "x86_64-linux"; });
+      devShells.aarch64-linux.default = mkShell (import nixpkgs { system = "aarch64-linux"; });
+    };
 }