I didn’t see who was working on the YOGA wiki and for some weird reason my thread is being denied (go figure).
A good idea for you would be to go to the rec and talk to one of the yoga instructors to get some more insight, maybe even ask if you can take a photo or two during a class to put up for your project. Think about it like someone has never heard of yoga and is going into it for the first time. They used to tell us to do that when I worked at the women’s gym in Hibbing. It may help with the history of it a little bit more, plus you’re getting a certified expert’s insight.