home: put modules into folders

home/direnv/default.nix

@@ -0,0 +1,19 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.direnv;
+in
+{
+  options.my.home.direnv = with lib.my; {
+    enable = mkDisableOption "direnv configuration";
+  };
+
+  config.programs.direnv = lib.mkIf cfg.enable {
+    enable = true;
+    nix-direnv = {
+      # A better `use_nix`
+      enable = true;
+      # And `use_flake`
+      enableFlakes = true;
+    };
+  };
+}