This site is hand-coded by me in Atom.
The typeface for headings is Libre Baskerville, from Impallari Type using Google Fonts. It's based on Baskerville, from the American Type Founder in 1941. It's easier for reading on-screen because it has a taller x-height, wider counters and a little less contrast.
For everything else, the typeface is the lovely, generic Serif.