add support for jupyter notebook 7

[edublancas]

In #1123 we realized that our tests failed because notebook 7 was released. we need to evaluate adding support for it, here are a few scenarios:

• supporting 6.x and 7.x (best option, but we'd have to see how difficult this will be)
• only support 7.x (ok option
• do not support 7.x (worst option)

[mehtamohit013]

AC Criteria:

• Analyze and scope out jupyter notebook to decide what are the possible cases to migrate to server 7
• Migrate to notebook 7 while still support 6
• Testcases
• Documentation
• Changelog

[edublancas]

go ahead!

[mehtamohit013]

Regarding this issue, it seems like the ploomber Jupyter extension has been based on the Jupytext Jupyter extension, but after browsing the Jupytext repo, it seems like the changes are scattered over several PRs and issues, which makes it very difficult to track.

So, based on the timeline(internship end: 25 Aug), I may not be able to get significant progression out of it. So, @edublancas can you assign me a different issue?

Thanks

[edublancas]

please post whatever links you found so we can document it and whoever works on this can find the resources easily, I'll assign something else

[mehtamohit013]

• Migration Guide
• Server Extension
• Simulatanous Use
• Jupytext Server Extension
• Migrate notebook to server