docs: added customer storefront guides (#7685)

* added customer guides

* fixes to sidebar

* remove old customer registration guide

* fix build error

* generate files

* run linter

www/apps/resources/app/architectural-modules/notification/send-notification/page.mdx

@@ -30,7 +30,7 @@ import { INotificationModuleService } from "@medusajs/types"
 
 export default async function productCreateHandler({
   data,
-  container
+  container,
 }: SubscriberArgs<{ id: string }>) {
   const notificationModuleService: INotificationModuleService =
     container.resolve(
@@ -41,7 +41,7 @@ export default async function productCreateHandler({
     to: "shahednasser@gmail.com",
     channel: "email",
     template: "product-created",
-    data: "data" in data ? data.data : data
+    data: "data" in data ? data.data : data,
   })
 }