Write a 'SendLit with Amazon SES in ~15 minutes' guide #28

Add a docs page for the most common self-host setup.

• Least-privilege IAM policy, configuration set, and SNS topic for bounce and complaint events.
• Wording for the SES production-access request.
• A docker compose up path.
• A cost example, for instance SES at about $0.10 per 1,000 emails with no per-subscriber fee.

Complements #4.