Pluto Cells Grouping

[MKAbdElrahman]

It would be great if we allowed cells grouping. This will allow us to shrink and expand sections of the notebook. Also, allows us to split the notebook into slides and have interactive presentations.

[fonsp]

Thanks for the tip! Can you post this to our suggestion box instead? #182

If you would like to discuss the underlying issue, and not just the feature request itself, consider opening a Discussion (https://github.com/fonsp/Pluto.jl/discussions), but first look at the existing issues and discussions for similar topics.