⚠️ Fix most animations/transitions performance issues

- Basically add `will-change` to CSS elements to enable GPU animations, less choppy, more sassy
- Use requestAnimationFrame over setTimeout
- Avoid repaints AMAP

src/animations/page.js

@@ -10,7 +10,6 @@ export const animateIn = () => {
         easing: 'easeOutQuart',
         duration: animDuration
     })
-
     // Simple slide and fade on each part of the page
     tl.add({
         targets: document.querySelectorAll('.page__part'),