Updating jQuery-based Lazy Image Loading to IntersectionObserver

Five years ago I implemented "lazy loading" of the 600+ images on my podcast's archives page (I don't like paging, as a rule) over here https://www.hanselminutes.com/episodes. I did it with jQuery and a jQuery Plugin. It was kind of messy and gross from a purist's perspective, but it totally worked and has easily saved me (and you) hundreds of dollars in bandwidth over the years. The page is like 9 or 10 megs if you load 600 images, not to mention you're loading 600 freaking images.