Update documentation with contributions and references

[luigibonati]

Description

This pr targets #74

Todos

Notable points that this PR has either accomplished or will accomplish.

• [x] update install instructions (pip + source)
• [x] add contribution page
• [x] change license to MIT (change license file and in pyproject)
• [X] add references within CVs docstrings

Status

• [x] Ready to go

[codecov[bot]]

Codecov Report

Merging #78 (3c755ed) into main (c4f8518) will not change coverage. The diff coverage is n/a.