Improve codeblock highlight style

[nolannbiron]

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RND-6145 Improve code blocks style

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Latest commit: e5893e7

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit	https://421e75a5.gitbook-open.pages.dev	✅
PR	https://pr3048.gitbook-open.pages.dev	✅

Version 2 (experimental)

Version	URL	Status
Vercel	https://gitbook-v2-ov1ca1fz2-gitbook.vercel.app	✅
Cloudflare	https://0de2e053-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	v1	v2
GitBook	https://421e75a5.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-ov1ca1fz2-gitbook.vercel.app/url/docs.gitbook.com
E2E	https://421e75a5.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-ov1ca1fz2-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v1 (Inspect)	⚠️ Changes detected (Review)	2 changed	Mar 26, 2025, 5:51 PM
customers-v2 (Inspect)	⚠️ Changes detected (Review)	3 changed	Mar 26, 2025, 5:53 PM
default (Inspect)	⚠️ Changes detected (Review)	8 changed	Mar 26, 2025, 5:55 PM
v2-vercel (Inspect)	⚠️ Changes detected (Review)	8 changed	Mar 26, 2025, 5:55 PM