Understanding Gaussians

I like the font, images, and layout of this article. Does anyone happen to know if a tool (that I can also use) helped achieve this look?

Or if not, does anyone know how to reach the author? I may have missed it, but I didn't even see the author's name anywhere on the site.

The author is Peter Bloem, and the html is compiled from these sources: https://github.com/pbloem/gestalt.ink

with the help of mathjax: https://www.mathjax.org/

The font seems to be Georgia.