RFC: Move deprecated APIs in sidebar

[kassens]

This is a proposal how we can retain pages for deprecated APIs while maintaining an "evergreen" page that avoids creating versioned copies.

This adds a new navigation entry for the deprecated React DOM APIs where they can remain. I greyed out the text to de-emphasize the navigation entry.

The moved doc pages retain their original URL even when they're under a different entry now. We could also consider making the old URLs a redirect to a /deprecated/ path.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 16, 2024 4:16pm

[github-actions]

Size changes

📦 Next.js Bundle Analysis for react-dev

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

Five Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/404	79.9 KB (🟡 +30 B)	183.81 KB
/500	79.9 KB (🟡 +30 B)	183.8 KB
/[[...markdownPath]]	81.7 KB (🟡 +47 B)	185.6 KB
/errors	80.08 KB (🟡 +30 B)	183.99 KB
/errors/[errorCode]	80.06 KB (🟡 +30 B)	183.96 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

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Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.