Refactor configuration to be more modular.

TODO: Update the documentation in the README to reflect changes

modules/desktop/apps/games.nix

@@ -1,6 +1,16 @@
 { pkgs, ... }:
 
 {
+  environment.persistence."/nix/persist".users.hu.directories = [
+    ".steam"
+    ".local/share/Steam"
+    ".local/share/honkers-railway-launcher"
+    ".local/share/PrismLauncher"
+    ".xlcore"
+    ".local/share/Euro Truck Simulator 2"
+    ".local/share/osu"
+  ];
+
   programs.steam = {
     enable = true;
     remotePlay.openFirewall = false;
@@ -14,5 +24,11 @@
     osu-lazer-bin
     protontricks
   ];
+
+  # Minecraft server
+  networking.firewall = {
+    allowedTCPPorts = [ 25565 ];
+    allowedUDPPorts = [ 25565 ];
+  };
 }