docs: add Cloudflare Workers transport guide

[agata]

This pull request is the documentation for what we implemented in #502 .

Summary

• add Cloudflare Workers transport guide and localizations
• surface the guide within navigation, troubleshooting, and voice transport docs
• publish a reusable example for configuring the Cloudflare realtime transport

Testing

• pnpm lint

[changeset-bot]

⚠️ No Changeset found

Latest commit: a76b897

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[seratch]

Thank you!