Not OP, but I can recommend the handy https://github.com/kynan/nbstripout which acts as a git filter which makes version control ignore cell outputs.

With that approach, though notebooks are clean they're still fairly poor for easily evaluating diffs between versions. If code review / diffs are more important than preserving the notebook, then you could use a post save hook to convert notebook input to a .py file and output to .html:

https://towardsdatascience.com/version-control-for-jupyter-n...