chore: uiv2 docz custom page (#1511)

* feat: Customized Docz Layout

* manually apply padding into playground

* fix playground bug -- sticky items

* fix window

* remove specifc tailwind style for docz

platform/ui/src/components/Label/Label.mdx

@@ -13,7 +13,11 @@ import Label from './';
 
 <Playground>
   {() => {
-    return <Label text="Label" />;
+    return (
+      <div className="p-4">
+        <Label text="Label" />
+      </div>
+    );
   }}
 </Playground>