It's only taken four and a bit years, but I finally got around to updating ExpressionEngine on this site. The site was running 2.11.9 and it's now on the latest version, 5.2.4. The main reason for the upgrade was because the way I had been dealing with images and code in blog posts wasn't ideal, it wasn't very flexible or user-friendly when creating content, and on the front end, the output wasn't responsive enough.