Fix local dev db

[Gabe-Levin]

What I changed

1. Fix issue with the .pgdata rm command hanging when called. The .pgdata directory became undeletable because Docker’s gRPC-FUSE backend left corrupted metadata. Specifying a volume for this data to be saved in instead of a host bind mount make the docker compose down -v --remove-orphans handle this deletion gracefully.
2. Fix mounting issue on ubuntu by changing the directory for the sample data parquet files.
3. Auto register the dev database in the pgadmin instance
4. Update readme

[github-actions]

PR Deployment Details:
🚀 PR deployed to https://ji3mwut11a.execute-api.us-east-1.amazonaws.com/

[bpstewar]

Looks good