Update lazy load to use browser API IntersectionObserver (with Lozad.js plugin)

There is a new lazy loading paradigm out now using a new browser API called IntersectionObserver…supposedly this is the most performant way to lazy load images. There is a lightweight plugin (500kb) called Lozad.js (with accompanying polyfill for older browsers) that uses this. Would love to see it implemented. It is vanilla JS, has no dependencies, and is most performant way to lazy load images.

https://apoorv.pro/lozad.js/