fix: section groups went missing

[BrettJephson]

We temporarily lost section groups as we were using the flattened section list to populate navigation.

[changeset-bot]

🦋 Changeset detected

Latest commit: afdb0a2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
gitbook-v2	Patch
gitbook	Patch

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[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit	https://b8679588.gitbook-open.pages.dev	✅
PR	https://pr2891.gitbook-open.pages.dev	✅

Version 2 (experimental)

Version	URL	Status
Vercel	https://gitbook-v2-igrzp94tq-gitbook.vercel.app	✅
Cloudflare		✅

Test content

Site	v1	v2
GitBook	https://b8679588.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-igrzp94tq-gitbook.vercel.app/url/docs.gitbook.com
E2E	https://b8679588.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-igrzp94tq-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers (Inspect)	👍 Changes approved	188 changed	Feb 27, 2025, 5:34 PM
customers-v2 (Inspect)	👍 Changes approved	108 changed	Feb 27, 2025, 5:34 PM
default (Inspect)	👍 Changes approved	576 changed, 12 added	Feb 27, 2025, 5:37 PM