chore: replace nixfmt package

Author: tboerger

flake.nix

@@ -57,7 +57,7 @@
               default = {
                 git-hooks = {
                   hooks = {
-                    nixfmt-rfc-style = {
+                    nixfmt = {
                       enable = true;
                     };
                   };
@@ -71,7 +71,7 @@
                 };
 
                 packages = with pkgs; [
-                  nixfmt-rfc-style
+                  nixfmt
                 ];
               };
             };