I'm the founder of Execute Program (https://www.executeprogram.com), where we've done a similar thing (knowledge graph + SRS) for programming languages/tools since 2019. Interesting to see that you have a graphviz render of a subgraph right on the landing page! We've toyed with the idea of exposing the graph visually, but haven't done it yet.
The UI/UX of executeprogram is genuinely amazing and the way lessons are broken down is extremely well-thought out!
Definitely recommended for anyone wanting to learn JS/TS, regex, and SQL (especially in conjunction with Jennifer Widom's Intro to Database lectures).
(Given your background with Ruby, have you thought about doing a Ruby course? I find it relatively easier finding resources for JS, Python, and even Rust. I imagine you could make an amazing Ruby introduction, though perhaps it would require more work than JS/TS than I would expect.)
