Introduce Quarto CI

[kellertuer]

It would be nice to have the tutorials automatically rendered on CI as well. For that we would need in the documentation.yml CI

• a python dependency for
• Jupyter to run
• Quarto with quarto render on the tutorials folder

But also a way to cache the results in order to not render all tutorials on every documenter run, but only if the corresponding .qmd file changed.

[kellertuer]

This is resolved in the new Manopt.jl 0.4.22