treewide: move nixos modules

modules/nixos/games/tetris/default.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+
+{
+  options.chvp.games.tetris.server = lib.mkOption {
+    default = false;
+    example = true;
+  };
+
+  config = lib.mkIf config.chvp.games.tetris.server {
+    chvp.services.nginx.hosts = [{
+      fqdn = "tetris.vanpetegem.me";
+      options = {
+        root = "${pkgs.tetris}";
+        locations."/".index = "index.html";
+      };
+    }];
+  };
+}