chore: reorganize docs apps (#7228)

* reorganize docs apps

* add README

* fix directory

* add condition for old docs

www/apps/resources/references/modules/notification/page.mdx

@@ -0,0 +1,12 @@
+import { TypeList } from "docs-ui"
+
+# notification
+
+## Classes
+
+- [AbstractNotificationService](../../notification/classes/notification.AbstractNotificationService/page.mdx)
+
+## Interfaces
+
+- [ReturnedData](../../notification/interfaces/notification.ReturnedData/page.mdx)
+- [INotificationService](../../notification/interfaces/notification.INotificationService/page.mdx)