docs: update to next 15 + eslint 9 (#9839)

* update next

* updated react

* update eslint

* finish updating eslint

* fix content lint errors

* fix docs test

* fix vale action

* fix installation errors

www/apps/resources/app/commerce-modules/customer/examples/page.mdx

@@ -195,7 +195,7 @@ export async function POST(request: MedusaRequest, res: MedusaResponse) {
 ```ts
 import { NextResponse } from "next/server"
 
-// eslint-disable-next-line prettier/prettier
+ 
 import { initialize as initializeCustomerModule } from "@medusajs/medusa/customer"
 
 export async function POST(request: Request) {