docs(realtimekit): add data retention page for easy access in RealtimeKit product

[ravindra-cloudflare]

Summary

Add data retention page for RealtimeKit product

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 897a130.

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[github-actions]

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

Pattern	Owners
/src/content/docs/realtime/	@ravindra-cloudflare, @roerohan, @cloudflare/realtime, @cloudflare/RealtimeKit, @cloudflare/product-owners

[cloudflare-workers-and-pages]

🚀 Deploying Preview to Cloudflare 🚀

Preview URL: https://realtimekit-data-retention.previews.developers.cloudflare.com (commit 897a130)

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[github-actions]

Preview URL: https://897a130a.preview.developers.cloudflare.com
Preview Branch URL: https://realtimekit-data-retention.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/realtime/realtimekit/data-retention/	https://realtimekit-data-retention.preview.developers.cloudflare.com/realtime/realtimekit/data-retention/
https://developers.cloudflare.com/realtime/realtimekit/legal/	https://realtimekit-data-retention.preview.developers.cloudflare.com/realtime/realtimekit/legal/