I’ve recently updated my repository to a react app, my site was previously held in another repository (https://github.com/playwithbear/whatsinstandard-pokemon), but was just standard HTML/CSS/JS and had my custom domain (https://standardpokemon.tk/) pointed at it.
After uploading my react app to the new repository, I confirmed it was working on GH Pages at: https://jonmccallum.co.uk/standardpokemon and the site rendered correctly.
So, I removed the CNAME file from my other repository, then archived it. Then assigned standardpokemon.tk to the new repository. After this the page only renders blank.
Edit: Just so my site isn’t down, I’ve added the CNAME back to the original repository.
My repository here: https://github.com/playwithbear/standardpokemon