[Merged by Bors] - Jupyterhub cluster

[adwk67]

Description

Update to the JupyterHub to demonstrate jobs running with multiple executors

(to test locally before merging, change stacks.yaml to point to a local stacks file with local references)

Review Checklist

• [ ] Code contains useful comments
• [x] Documentation added (or not applicable)

Once the review is done, comment bors r+ (or bors merge) to merge. Further information

[adwk67]

bors merge

[bors[bot]]

Pull request successfully merged into main.

Build succeeded:

• Run Rustfmt