Bash wizard to onboard new codespaces sessions

[ewels]

It'd be great to have an interactive terminal command that is launched when a new codespace is created. This could walk the end user through the initial steps of finding and orienting with the relevant course material.

1. Welcome user
2. Ask which course they want to do (select from list)
3. Set up accordingly

Set up should mostly be relaunching code with a different directory base for the workspace (eg. /workspace/training/hello-nextflow) so that only the file relevant to that course are visible in the sidebar.

Additional actions could also be taken, for example setting VSCode extension settings (see nextflow-io/vscode-language-nextflow#95).

[ewels]

This task was made for charmbracelet/gum (or of course rich / Questionary if it gets more complex and Python is warranted).