Update Vanilla Extract Example

[SuttonJack]

What?

• Adds an updated Vanilla Extract example
• Note that @vanilla-extract/next-plugin currently requires experimental: { appDir: true } to be set.

Why?

• The documentation currently links to a personal repo
• Closes Moving into Next.js examples repo? SuttonJack/vanilla-extract-app-dir#2

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[shuding]

Note that @vanilla-extract/next-plugin currently requires experimental: { appDir: true } to be set.

Maybe we can ship vanilla-extract-css/vanilla-extract#1099 first so that's no longer needed?

[SuttonJack]

@shuding That'd be ideal

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Edit: shipped and updated the PR - thanks!

[socket-security]

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Pull request alert summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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📊 Modified Dependency Overview:

➕ Added Package	Capability Access	+/- Transitive Count	Publisher
@types/[email protected]	None	+0	types