Website: disable animations if requested on benchmark page

Respect the user agent's prefers-reduced-motion preference [1] by
disabling our sexy animations if prefers-reduced-motion is in effect
('reduce').

[1] https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion

Author: strager

website/public/benchmarks/benchmark.css

@@ -13,6 +13,11 @@ body.javascript .javascript-only {
 .chart {
   --transition-duration: 0.5s;
 }
+@media (prefers-reduced-motion) {
+  .chart {
+    --transition-duration: 0;
+  }
+}
 .chart .series .bar,
 .chart .series .label,
 .chart .series .error-bars,