lint: normalize text block in text cells

[Borda]

🚀 Feature

Parse the markdown cells in a script and normalize them to give line length

Motivation

reduce manual formating and keep the text homogenous

Pitch

would be nice to have it as CI/precommit

Alternatives

check this pre-commit hook https://github.com/markdownlint/markdownlint
see: https://www.geeksforgeeks.org/textwrap-text-wrapping-filling-python/
use: https://mdformat.readthedocs.io/en/stable/users/installation_and_usage.html

Additional context

need to recognise and eventually skip some equations which shall be kept compact