major restructuring for using snowfall

modules/home/direnv/default.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.modules.shell.direnv;
+in {
+  options.modules.shell.direnv = { enable = mkOption { default = false; }; };
+
+  config = mkIf cfg.enable {
+    programs.direnv = {
+      enable = true;
+      enableZshIntegration = true;
+    };
+  };
+}