Refactor: simplify scripts

[Borda]

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• Did you write any new necessary tests?

What does this PR do?

working with bash/shell is just pain 😃

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[Borda]

@ethanwharris cold ou pls check that the thumb pat is correct after refactor 🐰

[justusschock]

Can we not include the thumbnail as png here and maybe store it on s3? Once added we never get rid of it from the history and since it's binary every change will be tracked as a new file.

I know that this file is not that large but since we already have a quite large history and every bit counts, I'd rather not add this

[Borda]

I know that this file is not that large but since we already have a quite large history and every bit counts, I'd rather not add this

I would not have much concern about thumbnails, but rather all other illustrations...
on the other hand, when someone accidentally deletes it in S3, it is lost... so that we allow images here but precommut preventing adding large files:
https://github.com/PyTorchLightning/lightning-tutorials/blob/5dd7b1c261a3fb6bd5788a9f13f7e95d3ede4987/.pre-commit-config.yaml#L21

[tchaton]

LGTM !

[ethanwharris]

@Borda Seems to be working, LGTM 😃