add b3-typography to render plain text content

src/hello.svelte

@@ -6,6 +6,8 @@
     import { onDestroy, onMount } from "svelte";
     import { version } from "./api";
     import { showMessage } from "siyuan";
+    import Typo from "./libs/b3-typography.svelte";
+
     export let name: string;
     export let i18n: any;
 
@@ -43,9 +45,10 @@
         </div>
     </div>
 
-    <div>
+    <Typo>
+        <h2>Wellcome to plugin sample with vite & svelte</h2>
         <p>{@html i18n.makesure}</p>
-    </div>
+    </Typo>
 
 </div>