Update to CodePen URL

[chriscoyier]

Updating to CodePen's official documented format for starting Pens with prefilled content. There is also a Prefill API, but that requires a POST, so this URL format is easier to use. But it does require that there is already an existing Pen that it copies the content out of. The Pen in this PR is this one owned by me. I can promise I'll never update that Pen, but if you want to go with this approach, you might wanna update the "slug" to a Pen owned by React on CodePen. Let me know there are any questions!

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Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[chriscoyier]

In order to merge any pull request (code, docs, etc.), we require contributors to sign our Contributor License Agreement, and we don't seem to have one on file for you.

Done.

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Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!