Add "Content-Signal" to robots.txt

[SamyPesse]

https://contentsignals.org/

[changeset-bot]

🦋 Changeset detected

Latest commit: fce5ab1

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

This PR includes changesets to release 1 package

Name	Type
gitbook	Minor

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-61l4bbz60-gitbook.vercel.app	✅
Cloudflare	https://7efea479-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-61l4bbz60-gitbook.vercel.app/url/gitbook.com/docs	https://7efea479-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-61l4bbz60-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://7efea479-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2-cloudflare (Inspect)	✅ No changes detected	-	Apr 20, 2026, 11:38 AM
customers-v2-vercel (Inspect)	👍 Changes approved	2 changed	Apr 20, 2026, 11:37 AM
v2-cloudflare (Inspect)	✅ No changes detected	-	Apr 20, 2026, 11:42 AM
v2-vercel (Inspect)	👍 Changes approved	4 changed	Apr 20, 2026, 11:42 AM