Add section for examples notebooks

[luigibonati]

Description

• Split CVs tutorial notebooks in tutorial part + atomistic example
• Created example section in doc, collecting paper experiments + atomistic examples

Status

• Ready to go

[codecov]

Codecov Report

Merging #79 (91ac57d) into main (dfeebca) will not change coverage.
The diff coverage is n/a.

❗ Current head 91ac57d differs from pull request most recent head c292ad8. Consider uploading reports for the commit c292ad8 to get more accurate results