move users to generic subfolder

configuration.nix

@@ -6,7 +6,6 @@ in
 {
   imports = [
     ./hardware-configuration.nix
-    ./users.nix
     ./generic/api/api.nix
     ./generic/modules/api.nix
     ./generic/modules/userdata.nix
@@ -26,6 +25,7 @@ in
     ./generic/system/limits.nix
     ./generic/system/tmpfiles.nix
     ./generic/system/userdata.nix
+    ./generic/system/users.nix
   ];
 
   nixpkgs.overlays = [ (nix-overlay) ];