Quick way to get the FUN page from a JupyterBook page and the other way around?

Very often we want to navigate between the two, having a quick way to do it (even super hacky with a list of correspondence URLs in a Python dictionary) could help.

Also it would be great as a way to semi-automatically compare side-by-side content between the two and identify content drift e.g. quizzes.

Maybe over-engineering not sure ...

I am not sure how stable the FUN URLs are, I am guessing they don't change within one session otherwise 💔