add webview

docs/.vitepress/config.mts

@@ -4,6 +4,7 @@ import { defineConfig } from "vitepress";
 export default defineConfig({
   title: "zh grammar",
   description: "Chinese grammar excerpts and interactive app",
+  lang: "zh-CN",
   themeConfig: {
     // https://vitepress.dev/reference/default-theme-config
     outline: {