Update requirements for python 3.11, add gitignore, and improve README

[bitofbreeze]

This PR:

• updates the dependencies rawpy and tensorflow to the minimum version that is compatible with Python 3.11.9
• git-ignores the invisible file generated on macs, the virtualenv folder, and compiled Python files
• makes the README table of contents links relative so they work in forks too

[GuidoBartoli]

Updates on README and git-ignores are fine, thank you for looking into that!

Unfortunately tensorflow 2.16 is incompatible with NoisePrint (it’s not my code, I just made it work inside Sherloq), so this change cannot be made at the moment.

I hope someday I can port the more powerful TruFor framework into Sherloq, because it uses PyTorch which is more retro-compatible than TensorFlow.

[bitofbreeze]

Thanks @GuidoBartoli Noise print seems to continue working for me:

Can you elaborate if I'm missing something? Maybe this will break if you retrain the model?

[GuidoBartoli]

Ok, thanks for checking this, I also confirm that NoisePrint works with latest Tensorflow.