Add tutorial for shipping a public app with Ghost and Fly.io

[akulkarni]

Summary

• New agent-driven tutorial: ship a public Postgres-backed todo app to Fly.io with Ghost as the database, end-to-end from a single chat session.
• Pre-empts known friction points discovered during a real run-through: the recent pg/sslmode=require cert-verification regression, and flyctl launch --yes provisioning unwanted Fly Postgres clusters.
• Honest cost framing: titled around "$2/month", FAQ explains the 15-min-chunk failure mode that can blow past Ghost's 100-hour free tier.

Test plan

• Run the tutorial end-to-end with Claude Code (or another agent with MCP + Bash).
• Verify Step 3 local-test passes without an SSL crash.
• Verify Step 4 deploys without provisioning a Fly Postgres cluster.
• Verify the deployed app round-trips through the Ghost DB.
• Verify Step 7 cleanup leaves both flyctl apps list and ghost list empty.

🤖 Generated with Claude Code