Docs: Replace "twitter.com" to "x.com" (#65917)

### What?
Replace `twitter.com` links in the docs with `x.com`

### Why?
Now that Twitter (twitter.com) has officially moved to the x.com domain

### How?
- Replace the link, then click on the link to make sure there are no
problems

Closes NEXT-
Fixes #65916

---------

Co-authored-by: Sam Ko <sam@vercel.com>

docs/02-app/01-building-your-application/07-configuring/03-environment-variables.mdx

@@ -136,10 +136,10 @@ Next.js will automatically expand variables that use `$` to reference other vari
 
 ```txt filename=".env"
 TWITTER_USER=nextjs
-TWITTER_URL=https://twitter.com/$TWITTER_USER
+TWITTER_URL=https://x.com/$TWITTER_USER
 ```
 
-In the above example, `process.env.TWITTER_URL` would be set to `https://twitter.com/nextjs`.
+In the above example, `process.env.TWITTER_URL` would be set to `https://x.com/nextjs`.
 
 > **Good to know**: If you need to use variable with a `$` in the actual value, it needs to be escaped e.g. `\$`.
 

docs/02-app/02-api-reference/04-functions/generate-metadata.mdx

@@ -666,7 +666,7 @@ export const metadata = {
 
 The Twitter specification is (surprisingly) used for more than just X (formerly known as Twitter).
 
-Learn more about the [Twitter Card markup reference](https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/markup).
+Learn more about the [Twitter Card markup reference](https://developer.x.com/en/docs/twitter-for-websites/cards/overview/markup).
 
 ```jsx filename="layout.js | page.js"
 export const metadata = {

docs/05-community/index.mdx

@@ -24,7 +24,7 @@ If you have a question about Next.js, or want to help others, you're always welc
 
 ## Social Media
 
-Follow Next.js on [Twitter](https://twitter.com/nextjs) for the latest updates, and subscribe to the [Vercel YouTube channel](https://www.youtube.com/@VercelHQ) for Next.js videos.
+Follow Next.js on [Twitter](https://x.com/nextjs) for the latest updates, and subscribe to the [Vercel YouTube channel](https://www.youtube.com/@VercelHQ) for Next.js videos.
 
 ## Code of Conduct
 

docs/index.mdx

@@ -54,4 +54,4 @@ For optimal accessibility when using a screen reader while reading the docs, we
 
 ## Join our Community
 
-If you have questions about anything related to Next.js, you're always welcome to ask our community on [GitHub Discussions](https://github.com/vercel/next.js/discussions), [Discord](https://discord.com/invite/bUG2bvbtHy), [Twitter](https://twitter.com/nextjs), and [Reddit](https://www.reddit.com/r/nextjs).
+If you have questions about anything related to Next.js, you're always welcome to ask our community on [GitHub Discussions](https://github.com/vercel/next.js/discussions), [Discord](https://discord.com/invite/bUG2bvbtHy), [Twitter](https://x.com/nextjs), and [Reddit](https://www.reddit.com/r/nextjs).

packages/next/README.md

@@ -54,12 +54,12 @@ We have a list of **[good first issues](https://github.com/vercel/next.js/labels
 
 A list of the original co-authors of Next.js that helped bring this amazing framework to life!
 
-- Tim Neutkens ([@timneutkens](https://twitter.com/timneutkens))
-- Naoyuki Kanezawa ([@nkzawa](https://twitter.com/nkzawa))
-- Guillermo Rauch ([@rauchg](https://twitter.com/rauchg))
-- Arunoda Susiripala ([@arunoda](https://twitter.com/arunoda))
-- Tony Kovanen ([@tonykovanen](https://twitter.com/tonykovanen))
-- Dan Zajdband ([@impronunciable](https://twitter.com/impronunciable))
+- Tim Neutkens ([@timneutkens](https://x.com/timneutkens))
+- Naoyuki Kanezawa ([@nkzawa](https://x.com/nkzawa))
+- Guillermo Rauch ([@rauchg](https://x.com/rauchg))
+- Arunoda Susiripala ([@arunoda](https://x.com/arunoda))
+- Tony Kovanen ([@tonykovanen](https://x.com/tonykovanen))
+- Dan Zajdband ([@impronunciable](https://x.com/impronunciable))
 
 ---