Merge pull request 'Ralentir les animations ASCII si on détecte que l'utilisateur'trice a demandé au système de minimiser la quantité d'animation ou de mouvement.' (#44) from feat/a11y into preprod

Reviewed-on: Deuxfleurs/site#44

static/script-bon.js

@@ -38,7 +38,10 @@ function updateAnimation(id, frames, totalFrames) {
 
 }
 
-animate("illustration-accueil", 500);
-animate("rennes", 1000);
-animate("orsay", 2000);
+// If the user have a setting on their device to minimize the amount of non-essential motion
+const preferReduceMotion = window.matchMedia("(prefers-reduced-motion)").matches;
+
+animate("illustration-accueil", preferReduceMotion ? 1500 : 500); // Reduce framerate if use preference is to reduce motion
+animate("rennes", preferReduceMotion ? 3000 : 1000); // Reduce framerate if use preference is to reduce motion
+animate("orsay", preferReduceMotion ? 4000 : 2000); // Reduce framerate if use preference is to reduce motion
 animate("parterre", 1500);