Date: 2020-09-02
Accepted
GitHub Pages is a perfectly good static site host, however, not having the ability for preview builds is problematic when wishing to test changes prior to them being merged into the main branch. Netlify has the ability to create preview builds for each PR or even each branch along with a number of other benefits over GitHub Pages as can be seen in this (totally unbiased!) comparison.
The decision is to move hosting and deployment onto Netlify
Given the extremely low volume of usage this site achieves there are no perceived negative consequences.