docs: added how-to guides for architectural modules (#11883)

* added initial how-tos

* finished changes

* generated sidebars

www/apps/resources/utils/get-sidebar-for-path.ts

@@ -71,6 +71,10 @@ const sidebarMappings: {
       "/references/file-provider-module",
       "/references/locking",
       "/references/notification-provider-module",
+      "/references/notification-service",
+      "/references/event-service",
+      "/references/cache-service",
+      "/references/file-service",
     ],
   },
   {