Add AGU workshop slides to slides page

https://docs.google.com/presentation/d/13huOTE6EQUY84qzqiRbRdK8coB1ZooU2dDLv1OaNiqI/edit?usp=sharing

Also add link to the https://nasa-openscapes.github.io/2023-Cloud-Workshop-AGU/slides.html (currently embedded but would be nice to have a way to open them for easier reuse