Make the Code public

[Radonirinaunimi]

Followings are a few things that should be addressed in the view of making the code public:

Tasks

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1. Merge Compute Chi2 for non-fitted datasets when generating the report #77
2. Finally fix Workflow Container workflow #46
3. Merge CHARM matching datasets. #76
4. Clean the repo by removing folders that do not belong to the package. These are: pdfs_lo, validation, xsec-grids, yad_bench. These folders should instead be moved to the paper directory.
5. Rename repository and package to NNSFnu in order to be consistent with the paper ⚠️
6. Update documentation. This includes: add a couple of representative plot(s), create a page that links to the LHAPDF grids and NNSFnu model.
7. Deploy package to PyPI (write the corresponding github action).
8. Merge Define keys to dump in LHAPDF.info file #80
9. Merge Add delivery page to docs #82