Fix flash of unstyled content issue

The style reset also resets the CSS import so we need to duplicate it.

src/routes/docs/examples/__layout.reset.svelte

@@ -1,3 +1,7 @@
+<script>
+  import "../../../app.css";
+</script>
+
 <div class="flex flex-col items-center justify-center">
   <slot />
 </div>