used pipe-operator on module import lambdas

modules/services.nix

@@ -1,12 +1,10 @@
 { lib, ... }:
 {
   imports =
-    let
-      serviceFiles = builtins.filter (file: builtins.match ".*\\.nix" file != null) (
-        builtins.attrNames (builtins.readDir ./services)
-      );
-    in
-    map (file: ./services/${file}) serviceFiles;
+    builtins.readDir ./services
+    |> builtins.attrNames
+    |> builtins.filter (file: builtins.match ".*\\.nix" file != null)
+    |> map (file: ./services/${file});
   my.services = {
     network.enable = lib.mkDefault false;
     nvidia.enable = lib.mkDefault false;