move limits to generic subfolder

configuration.nix

@@ -12,7 +12,6 @@ in
     ./users.nix
     ./api/api.nix
     ./api/api-module.nix
-    ./resources/limits.nix
     ./generic/services/backup/restic.nix
     ./generic/services/cloud/nextcloud.nix
     ./generic/services/git/gitea.nix
@@ -26,6 +25,7 @@ in
     ./generic/services/vpn/ocserv.nix
     ./generic/services/webserver/memcached.nix
     ./generic/services/webserver/nginx.nix
+    ./generic/system/limits.nix
   ];
 
   nixpkgs.overlays = [ (nix-overlay) ];