flake: formatter

this was very unformatted LMAO

Signed-off-by: Artur Manuel <balkenix@outlook.com>

flake.nix

@@ -16,9 +16,11 @@
       systems = [
         "x86_64-linux"
       ];
+
       flake = {
         overlays.default = final: _prev: import ./overlay final.pkgs;
       };
+
       perSystem = { pkgs, self', config, system, ... }: {
         _module.args.pkgs = import inputs.nixpkgs {
           inherit system;
@@ -32,6 +34,8 @@
 
         apps.pankomacs.program = "${self'.packages.pankomacs}/bin/emacs";
         apps.default = config.apps.pankomacs;
+
+        formatter = pkgs.nixpkgs-fmt;
       };
     };
 }