Fix mathjax rendering

[MNassimM]

• Kind: bugfix

• Close #365

Description

This PR updates MathJax to version 3.2, improves its integration into the tutorial system, and adds an explanation of its usage in exercises.

Checklist

• [x] Read the CONTRIBUTING.md guide and:

  • [x] Use Atomic Commits so each commit gathers a single logical change
  • [x] Use Conventional Commits regarding commit messages (needed by our release toolchain)

Note to maintainers

• Read this wiki page.
• Make sure the PR has a milestone.
• Assign yourself before merging.
• [ ] Either do a regular merge:
  • for PRs containing several commits following conventional-commits,
  • or for PRs containing 1 commit shared with a later PR (to preserve the SHA1)
• [ ] Or do a squash-merge:
  • for PRs containing only 1 commit (not shared with a later PR),
  • or for PRs containing several commits that need not be kept in the history;
  • → Update the commit message header with a conventional-commit type,
  • → Add a footer Close #… if a related issue exists.