Fix buggy environment yml

[trevorcampbell]

This is a WIP to try to deal with OS-dependent environment setup

• Closes New environment.yml generation is buggy #12
• Closes unixodbc install bug on windows 10 #10

Unfortunately it appears there is no way to make environment.yml files OS-dependent, and it's not easy to install packages that aren't on conda forge (e.g. tidyclust). So I think we need to move to a more generic solution for environment setup when using JupyterLab Desktop.

This PR:

• removes the github action that dumps the conda environment from the docker image (won't work on windows due to unixodbc, doesn't capture packages not from conda)
• makes the code from the 1st edition conda env update --file ... spit out an error message with instructions for what to do instead
• [todo] adds new install code elsewhere