Test distributed computing with dask

[zonca]

After the discussion in #7, I have a prototype deployment of Dask Gateway accessible to the SuperCDMS users, see #43.

The documentation on how to use it is as usual at https://github.com/det-lab/jupyterhub-deploy-kubernetes-jetstream.

When someone in the team is ready to test it, @pibion, please first reply here and let me test it again, it has many moving parts and I would like to make sure it is usable before you spend time on it.