[WIP] start_jobqueue_tutorial command (Dask-Jobqueue's tutorial)

[dwhswenson]

This slightly changes the commands in jupyter.sh. The goal here is to have an easy setup for the Dask-Jobqueue tutorial as well. Might revert these back after the workshop.

New setup:

• start_slurm: only installs stuff for slurm and jupyter
• start_tutorial: calls start_slurm, clones jobqueue-features tutorial; launches it in Jupyter Lab
• start_jobqueue_tutorial: calls start_slurm, clones dask-jobqueue tutorial; launches it in Jupyter Lab

The goal is to have a single command to be used for each tutorial session.

WIP until I do a run-through of much of the jobqueue tutorial.

[ocaisa]

I don't think we should have closed this just yet, this also requires updates to README.md and ideally a fork of the dask_jobqueue tutorial that actually works on the docker setup out of the box (and tells you when it won't work).

[AdamWlodarczyk]

@ocaisa OK, I reverted changes.

[ocaisa]

@dwhswenson Can you open a new PR for this, it's still a good idea