Modified nvim setup a bit + installed game apps (steam, lutris, etc)

hosts/nixos/common/optional/sddm.nix

@@ -1,8 +0,0 @@
-# Not using this for now, because I cannot get any theme to fucking work with it for some reason :(
-{
-  services.xserver = {
-    enable = true;
-    displayManager.sddm.enable = true;
-  };
-}
-

hosts/nixos/common/optional/steam.nix

@@ -0,0 +1,14 @@
+# TODO(imperanence): handle persistence
+{ lib, ... }: {
+  programs.steam = {
+    enable = true;
+    remotePlay.openFirewall = true; # Open ports in the firewall for Steam Remote Play
+    dedicatedServer.openFirewall = true; # Open ports in the firewall for Source Dedicated Server
+  };
+
+  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+    "steam"
+    "steam-original"
+    "steam-runtime"
+  ];
+}