docs: use docker compose down -v in uninstall section for robustness

[Copilot]

The uninstall section used separate docker compose down and docker volume rm meticai-data commands, which could fail if volume names don't match expectations.

Changes

• Replace two-step uninstall with docker compose down -v to remove containers and volumes atomically
• Add note about docker volume ls for pre-verification
• Align with existing "Reset everything" section pattern

Before:

docker compose down
docker volume rm meticai-data  # Optional: removes all data

After:

docker compose down -v  # -v removes all volumes and data

This ensures all volumes are removed regardless of actual names, avoiding cleanup failures.

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