Ep 4 update challenge 4.1

[ilessing]

update the challenge text to reflect the new directory structure of the example repo.

https://ucsbcarpentry.github.io/Reproducible-Publications-with-RStudio-Quarto/01-Project-Setup-Organization/02-good-project/index.html#challenge-41-take-a-few-minutes-to-look-through-the-workshop-project-files

[ilessing]

I think I've fixed this with commit: 06024d2 but it would be great to get a review from someone else.

[rcurty]

reviewed