Do a TON of organising into seperate files

nixos/common/steam.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  pkgs,
+  unstable,
+  inputs,
+  nix-your-shell,
+  ...
+}:
+
+{
+  programs.steam = {
+    enable = true;
+    package = pkgs.steam.override {
+      extraPkgs = (
+        pkgs:
+        with pkgs;
+        with unstable;
+        [
+          gamemode
+          unstable.mangohud
+          # additional packages...
+          # e.g. some games require python3
+        ]
+      );
+    };
+
+    remotePlay.openFirewall = true; # Open ports in the firewall for Steam Remote Play
+    dedicatedServer.openFirewall = true; # Open ports in the firewall for Source Dedicated Server
+    localNetworkGameTransfers.openFirewall = true; # Open ports in the firewall for Steam Local Network Game Transfers
+  };
+  programs.steam.gamescopeSession.enable = true;
+  programs.steam.protontricks.enable = true;
+  hardware.steam-hardware.enable = true;
+  programs.gamescope.enable = true;
+  programs.gamemode.enable = true;
+}