intro-to-python, 2024 refurbished version

This version does not add or modify any contents as compared to v0.0.0
from October 2020 but has updates year numbers and links.
Thus, it is ready to go for new lectures with non-updated contents.

intro-to-python, pre-2020 version

This version holds the git history of the project from before October 2020.
The project was entirely restructured in October 2020, including the
branching model.