feat: add resend integration docs for templates.

[christina-de-martinez]

Summary by cubic

Adds Resend Templates integration docs so users can set up API keys, upload templates, and manage the integration directly from React Email. Also tightens the send-email guide for a clearer flow.

• New Features
  • Added “Set up Templates with Resend” guide: obtain Full Access API key and run npx react-email@latest resend setup.
  • Documented how to upload or bulk upload templates from the Resend toolbar, with a demo video.
  • Added removal steps with npx react-email@latest resend reset.
  • Added CLI command reference for email resend setup and email resend reset.

^{Written for commit f2b00d5. Summary will update automatically on new commits.}

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Project	Deployment	Preview	Comments	Updated (UTC)
react-email	Ready	Preview	Comment	Nov 7, 2025 11:39am
react-email-demo	Ready	Preview	Comment	Nov 7, 2025 11:39am

[cubic-dev-ai]

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