Using GitHub issues as a CMS for this site still going ok.
GitHub made it so you have to be logged in to access images and videos uploaded to an Issue. So hotlinking to the images isn't doable any more.
Now there's some complicated markdown parsing that looks for links to images and videos and uses Cloudinary's Node SDK to upload those assets to Cloudinary.
I also noticed that the images were making the site slow to load so using Cloudinary to make the images smaller now and now the Lighthouse scores are good again.