Older version documentations

[hyunbinseo]

I currently do not have the resource to migrate to the latest versions, which had multiple breaking changes.

• Implement new layouts system #6174
• SvelteKit 1.0 migration guide (from SvelteKit alpha) #5774
• Implement #5748 #5778

Is there a way to read documentations of older versions of SvelteKit? (e.g. @1.0.0-next.405)

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P.S. Thank you for the breaking tags in changelogs and migration guides. It really helps a lot.