Support for Sign in with Apple

Vercel now supports Sign in with Apple for faster login access.

• •Users with Apple accounts can authenticate via a new Apple button on the login screen
• •If the Apple account email matches the Vercel account email, accounts are automatically linked
• •Supported Apple email domains include @icloud.com, @mac.com, and @me.com
• •If emails don't match, users can manually connect their Apple account from account settings