Codeathon 2024

[elisabettai]

What do these changes do?

Add new page: quick start guide for 2024 SPARC Codeathon, including some updates compared to the same page for last year. Bonus: add new jupyterlab (e.g. R, Julia) to the JupyterLab doc page,

Related issue number

https://github.com/ITISFoundation/osparc-issues/issues/1097

Checklist

• [x] I think the documentation is well written and up to date
• [x] Do NOTE have very large media files (e.g. photos, videos, etc)
• [x] My spell-checker passes
• [ ] If you write a new section, i take ownership adding my user in .github/CODEOWNERS