Using `codespell -q3 -w` that I just discovered. (https://github.com/codespell-project/codespell, pip install codespell)
Removes a lot of 'sudo -E' usage, and eventually should let us get rid of the $PATH override for jupyterhub-admins, which arguably is less secure than just dropping stuff into /usr/bin Also remove sudo -E from apt and mkdir calls. Not necessary.