chore(hosts/nixos-unstable): add nixpkgs-review, remove fork-only workerThread setting

hosts/nixos-unstable/configuration.nix

@@ -22,6 +22,7 @@
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
     packages = with pkgs; [
       tree
+      nixpkgs-review
     ];
   };
   users.users.bob = {
@@ -41,7 +42,6 @@
 
   services.nscd = {
     enableNsncd = true;
-    workerThreads = 2;
   };
   environment.systemPackages = with pkgs; [
   ];
@@ -53,5 +53,4 @@
   # networking.firewall.enable = false;
 
   system.stateVersion = "25.05"; # Did you read the comment?
-
 }