The animations are made using MoviePy library which is quite popular but struggles with finding new contributors [0]. I tried to bring that information to broader audience without a success [1], so I will take the opportunity here for greater good.
If you have ideas how rescue the MoviePy project or simply want to help. Please contribute to ongoing discussion on GH [0].
A loosely related complaint: it's surprisingly hard to present 3d animations. I've held my nose and used p5.js and three.js. Web VPython is almost what I want, but it's a nightmare to host locally.
Just making an arrow (cylinder with conical cap) in three.js or p5.js is kind of tedious.
If you have ideas how rescue the MoviePy project or simply want to help. Please contribute to ongoing discussion on GH [0].
[0]https://github.com/Zulko/moviepy/issues/1874 [1] https://news.ycombinator.com/item?id=33864865