refactor: moved nixos modules to dendrite pattern

modules/nixos/home-manager-adaptors/steam.nix

@@ -0,0 +1,20 @@
+{...}: {
+  flake.nixosModules.home-manager-steam = {
+    lib,
+    config,
+    ...
+  }: let
+    setupSteam =
+      lib.lists.any
+      (value: value)
+      (lib.attrsets.mapAttrsToList (name: value: value.programs.steam.enable) config.home-manager.users);
+  in {
+    config = lib.mkIf setupSteam {
+      programs.steam = {
+        enable = true;
+        # TODO: figure out how to not install steam here
+        # package = lib.mkDefault pkgs.emptyFile;
+      };
+    };
+  };
+}