move nur overlay to flake.nix

flake.nix

@@ -24,15 +24,14 @@
     inherit (self) outputs;
   in
   {
-    overlays = { nurPackages = nur.overlay; };
     nixosConfigurations.pim = nixpkgs.lib.nixosSystem {
       specialArgs = { inherit outputs; };
       system =  "x86_64-linux";
       modules = [
+        { nixpkgs.overlays = [ nur.overlay ]; }
         ./configuration.nix
         agenix.nixosModules.default
         home-manager.nixosModules.home-manager {
-          home-manager.extraSpecialArgs = { inherit nur; };
           home-manager.useGlobalPkgs = true;
           home-manager.useUserPackages = true;
           home-manager.users.pim = {