One of the answer I found in the forum while searching for the animation I like is to use Observer. Now I don't know how to start or where to begin specially with importing it. I tried  import { Observer } from "gsap/Observer"; gsap.registerPlugin(Observer); but it says that its not defined or can't find the class Observer. How do I use this? I saw one post saying I need to use Reactjs or start looking for React. But we are not using Reactjs. We are only using Drupal Twig Template and simp