Add slides from last LD

[jwbowers]

Add the slides from the last LD in Cote d'Ivoire. Link to book.

[jwbowers]

Actually, we need to add the slides from CERAP 2022, CERAP 2023, Bogota 2022, and Mexico 2023. I have all of the slides except CERAP 2023. @graemeblair @nahomi tagging you here for those slides. I have them on my computer (having extracted them from dropbox). I will add them to this repository and then add links to them in the main book after @graemeblair and @nahomi have gotten permissions from instructors.