Revert "Delete fourth_down_datasets.ipynb"

This reverts commit 3e19478069fd3c13f6df38a151bc55e8b22f1c83.
Revert "Delete fourth_down_plays.ipynb"

This reverts commit ef05550c19b6eb312fb8fb9f815a564b50343636.
Revert "Delete drive_by_drive.ipynb"

This reverts commit 9b43ea930441af8388ec79776913a9dcc28d6509.
nothing major