Challenge Solutions

The challenges through the lesson do not have any associated solution. Since Challenges appear to be qualitative, (e.g. [Final episode challenge](https://carpentries-incubator.github.io/python-humanities-lesson/08-working-with-sql/#challenge---saving-your-work), there should be some form of best practice solution provided.

Solutions could either be

- inline behind a disclosure a la other Carpentry lessons
- contained within a separate page, either as
- part of the episode lists
- or an appendix in `Extras`