Take out building hub-notebook from warmpool. Instead, move dockerfiles from hub-notebook to deployments/notebook and add back in the old build_ecr_image script that will build and push them to ecr from there.
delete refresh-nb-creds since we’re using data from efs now instead of s3, also remove all those aws_ cred envs (no need for any user auth stuff since data is in efs and notebook images are public)