Support for site customization option to change how external links open

[SamyPesse]

No description provided.

[changeset-bot]

🦋 Changeset detected

Latest commit: d38a6ad

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 1

Version	URL	Status
Latest commit	https://4f3ff359.gitbook-open.pages.dev	✅
PR	https://pr3372.gitbook-open.pages.dev	✅

Version 2

Version	URL	Status
Vercel	https://gitbook-v2-adz4qrmlc-gitbook.vercel.app	✅
Cloudflare	https://2e867686-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	2v	2c
GitBook	https://4f3ff359.gitbook-open.pages.dev/gitbook.com/docs	https://gitbook-v2-adz4qrmlc-gitbook.vercel.app/url/gitbook.com/docs	https://2e867686-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://4f3ff359.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-adz4qrmlc-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://2e867686-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	✅ No changes detected	-	Jun 22, 2025, 1:43 PM
customers-v2 (Inspect)	👍 Changes approved	74 changed	Jun 22, 2025, 1:44 PM
default (Inspect)	✅ No changes detected	-	Jun 22, 2025, 1:47 PM
v2-cloudflare (Inspect)	✅ No changes detected	-	Jun 22, 2025, 1:48 PM
v2-vercel (Inspect)	👍 Changes approved	6 changed	Jun 22, 2025, 1:47 PM