Revamp README with new content and structure

[ndem0]

Updated README to enhance structure, add installation instructions, and improve content clarity.

Description

Just a README revamping to fix the logo problem on PyPI and to a "News" section

This PR fixes #725

Checklist

• Code follows the project’s Code Style Guidelines
• Tests have been added or updated
• Documentation has been updated if necessary
• Pull request is linked to an open issue

[dario-coscia]

Very nice! I would also add Pytorch Ecosystem Blog as a badge. It would be nice to have it there.

Minor things:

1. The API diagram needs some semantic updates; some arrows are not correct. We can think about it
2. The code snippet should be highlighted with '''python<>'''
3. The PDE equation can be written in pure markdown, I think it will render better
4. I think there are too many emojis imho, but we can discuss it if you like them