fix: remove -webkit-tap-highlight-color

Some browsers use the `-webkit-tap-highlight-color` to set the color of
the highlight that appears over a link while it's being tapped. This
isn't desired, as we have, or plan to have interactive elements respond
visually to interactions.

assets/css/main.css

@@ -6,6 +6,7 @@
   html {
     @apply bg-neutral-800 text-neutral-200;
 
+    -webkit-tap-highlight-color: transparent;
     font-family: Roboto, sans-serif;
   }