add MathJax to website

[lauracmorris]

The professor I work for is working on updates to the site he hosts using Jekyll and this theme. The web designer who originally set up the site for him was a student who graduated and we're not able to contact him. Initially we would like to add superscript and subscript. We know that's not supported, but eventually we'd also like to add equations, so we thought MathJax would be a great way to take care of everything we want.

The instructions I've found mention editing head.html, which doesn't appear to exist in this theme. Do you have any suggestions of how to add MathJax?

TIA,

Laura