Modularized config

systems/modules/common.nix

@@ -0,0 +1,18 @@
+{ config, pkgs, ... }:
+
+{
+  nixpkgs.config.allowUnfree = true;
+
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  users.defaultUserShell = pkgs.zsh;
+
+  environment.systemPackages = with pkgs; [
+    gnumake
+    git
+  ];
+
+  security.rtkit.enable = true;
+
+  system.stateVersion = "25.11";
+}