Circle CI attempts and fails to run from gh-pages on each deploy

It seems it has been posting errors for quite a while now. But the website does update with the Circle CI from `main`, so maybe this doesn't matter?

https://app.circleci.com/pipelines/github/datatogether/website?branch=gh-pages

_Originally posted by @Frijol in https://github.com/datatogether/website/issues/106#issuecomment-754977568_