remove the beta badge for Next.js (#22258)

Author: vicb

src/content/docs/workers/frameworks/framework-guides/nextjs.mdx

@@ -3,8 +3,6 @@ pcx_content_type: how-to
 title: Next.js
 tags: ["full-stack"]
 description: Create an Next.js application and deploy it to Cloudflare Workers with Workers Assets.
-sidebar:
-  badge: Beta
 ---
 
 import {
@@ -16,10 +14,6 @@ import {
 	WranglerConfig,
 } from "~/components";
 
-:::note
-The OpenNext adapter is in currently in beta.
-:::
-
 **Start from CLI** - scaffold a Next.js project on Workers.
 
 <PackageManagers