This site uses the Academic Hugo theme, with some slight template modifications found in /assets/ and layouts/. The theme is included as a submodule, so when when cloning for the first time, use this command to get the theme too:
git clone --recursive https://github.com/gcushen/hugo-academic.git
To get the theme later, use this command:
git submodule add \
https://github.com/gcushen/hugo-academic.git \
themes/hugo-academic
To update to the latest version of the theme, use:
git submodule update --recursive --remote