fix: improve OneTrust cookie preferences modal accessibility

[diogoascarneiro]

Summary

Add focus management for OneTrust cookie preferences modal by automatically focusing the close button when the modal opens. Also import OneTrust-specific styles.

Screenshots (optional)

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 48fae6b.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/content-engineering, @kodster28
*.ts	@cloudflare/content-engineering, @kodster28
*	@cloudflare/product-owners

[github-actions]

Preview URL: https://48fae6bd.preview.developers.cloudflare.com
Preview Branch URL: https://feat-onetrust-styling.preview.developers.cloudflare.com