Move Nix files back to the root of the project

modules/home-manager/cli/notes.nix

@@ -0,0 +1,32 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.homeManagerModules.notes;
+in
+{
+  options.homeManagerModules.notes = {
+    enable = mkEnableOption "Enable notes";
+
+    directory = mkOption {
+      type = types.str;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home = {
+      packages = with pkgs; [ notes ];
+
+      sessionVariables = {
+        NOTES_DIRECTORY = "${cfg.directory}";
+      };
+    };
+  };
+
+}