⚠️ 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/style/_animations.scss

@@ -12,7 +12,10 @@
     display: flex;
     align-items: center;
     justify-content: center;
-    will-change: transform;
+
+    &, * {
+        will-change: transform, opacity;
+    }
 
     // Content
     &__loader {
@@ -29,7 +32,6 @@
         height: 100%;
         background-color: $color-primary;
         transform-origin: 50% 0;
-        will-change: transform;
     }
 
     // Hidden