Hey this looks really cool. Are you familiar with Metacademy? (https://metacademy.org/) (previously on HN: https://news.ycombinator.com/item?id=7617683) Looks like you are trying to do a very similar thing, although they are maybe operating on a more conceptual level.

What have you used to build the site and do the layout? I'm always interested in how people are using graph-based UIs since I've been working on one myself over at Thicket.io: https://thicket.io. (you can browse a graph of academic paper citations and then connect papers to policy arguments) It's a real challenge to display lots of information coherently.