Site: app regions with screenshots, props, downloads, English and Chinese, narrow layout; hit layer follows draw order

site/index.html

@@ -7,7 +7,7 @@
     <meta name="description" content="Six offline desktop apps for documents, sheets, slides, PDF, Git and Markdown." />
   </head>
   <body>
-    <main id="app"></main>
+    <div id="app"></div>
     <script type="module" src="/src/main.ts"></script>
   </body>
 </html>