Pypi Package

[AnanyaRaval]

This PR contains changes required for a PyPI package:

• Fix ruff and lint errors.
• Add docstrings in numpy format.
• Add docs.yml workflow file.
• Add mkdocs documentation for the package API.

[AnanyaRaval]

Comments by @dhanesh-vector :

1. Does the Repository structure in README.md reflect the updated contents ?
2. It seems the /blog directory is part of the commit. I suppose it is required to render the blog page.
3. If someone want to use this pypi package for their own work, what needs to be changed or adapted ? It should be the datasets file. But I don't see any instructions on the README that reflects this.  perhaps adding a subsection:
          "Using the model on your own dataset" would help clarify. Essentially ensuring that the specific feature columns are properly preprocessed (like normalization, taking care of missing data etc) and returning this
   return (
   x[valid],
   t[valid],
   event_type[valid],
   feature_names,
   n_continuous,
   feature_ranges,
   )