- themes/indigo is from https://github.com/AngeloStavrow/indigo.git
  circa 2020-01-31.  I didn't feel like forking the repo to my github
  in order to modify some things, so I just cloned it.  Yeah, I know
  that is bad practice, but I needed MathJax working and I'll
  probably just end up messing around with the theme anyway.