[stdf]Update Swiper compoent, demo and documents.

demo/src/routes/en_US/swiper/Item_en.svelte

@@ -4,10 +4,6 @@
 
 <div class="flex flex-col space-y-4 items-center">
 	<div class="text-center">This container uses a single component as its content</div>
-	<div>
-		<Avatar />
-	</div>
-	<div class="w-full">
-		<Button>button</Button>
-	</div>
+	<div><Avatar /></div>
+	<div class="w-full"><Button>button</Button></div>
 </div>