That's interesting. It's a data workspace platform called Hex. It's really something more like a Jupyter Notebook than a simple webpage.
I wrote some python code that's generating those charts. You're right that's overkill for what it ended up being.
I initially played around with giving the reader the ability to set their onion chopping time and see how it played out. It was getting a little complicated for the point I was trying to make I think.
EDIT: I've added that in now, which helps make it a little more fun I think.