Remove scroll-nojump utility and update layout structure

[nolannbiron]

Eliminated the .scroll-nojump utility and related CSS from globals.css and refactored layout components (Header, Footer, AnnouncementBanner, SpaceLayout) to remove unnecessary wrapper divs. Updated scrollbar styling to use native CSS properties for improved consistency and maintainability.

[changeset-bot]

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Latest commit: 4395489

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-oclwpuvnx-gitbook.vercel.app	✅
Cloudflare	https://0d3309ac-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-oclwpuvnx-gitbook.vercel.app/url/gitbook.com/docs	https://0d3309ac-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-oclwpuvnx-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://0d3309ac-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 (Inspect)	👍 Changes approved	7 changed	Aug 27, 2025, 4:41 PM
v2-cloudflare (Inspect)	👍 Changes approved	10 changed	Aug 27, 2025, 4:45 PM
v2-vercel (Inspect)	👍 Changes approved	10 changed	Aug 27, 2025, 4:44 PM