Removed flickering of color palette demo

Author: squidfunk

docs/setup/changing-the-colors.md

@@ -38,10 +38,14 @@ Click on a tile to change the color scheme:
   var buttons = document.querySelectorAll("button[data-md-color-scheme]")
   buttons.forEach(function(button) {
     button.addEventListener("click", function() {
+      document.body.setAttribute("data-md-color-switching", "")
       var attr = this.getAttribute("data-md-color-scheme")
       document.body.setAttribute("data-md-color-scheme", attr)
       var name = document.querySelector("#__code_0 code span.l")
       name.textContent = attr
+      setTimeout(function() {
+        document.body.removeAttribute("data-md-color-switching")
+      })
     })
   })
 </script>