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/book/app/advanced-development/admin/ui-routes/page.mdx

@@ -54,7 +54,7 @@ export const highlights = [
 ]
 
 ```tsx title="src/admin/routes/custom/page.tsx" highlights={[["21"], ["22"], ["23"], ["24"], ["25"], ["26"]]}
-import { defineRouteConfig } from "@medusajs/admin-shared";
+import { defineRouteConfig } from "@medusajs/admin-shared"
 import { ChatBubbleLeftRight } from "@medusajs/icons"
 
 const CustomPage = () => {
@@ -125,7 +125,7 @@ export const config = defineRouteConfig({
   label: "Custom",
 })
 
-export default CustomSettingPage;
+export default CustomSettingPage
 ```
 
 This adds a page under the path `/app/settings/custom`. An item is also added to the settings sidebar with the label `Custom`.

www/apps/book/app/advanced-development/admin/widgets/page.mdx

@@ -80,7 +80,7 @@ import { defineWidgetConfig } from "@medusajs/admin-shared"
 import { DetailWidgetProps, AdminProduct } from "@medusajs/types"
 
 const ProductWidget = ({ 
-  data
+  data,
 }: DetailWidgetProps<AdminProduct>) => {
   return (
     <div>