dev/nil & dev/nixd: add nixfmt

modules/dev/nil.nix

@@ -11,6 +11,7 @@ in
     environment.systemPackages = with pkgs; [
       nil
       alejandra
+      nixfmt
     ];
   };
 }

modules/dev/nixd.nix

@@ -21,6 +21,7 @@ in {
     environment.systemPackages = with pkgs; [
       unstable.nixd
       alejandra
+      nixfmt
     ];
   };
 }