docs: update index page

docs/src/components/HomepageFeatures/index.js

@@ -28,8 +28,7 @@ const FeatureList = [
     Svg: require('@site/static/img/undraw_docusaurus_react.svg').default,
     description: (
       <>
-        Extend or customize your website layout by reusing React. Docusaurus can
-        be extended while reusing the same header and footer.
+        Touying is powered by Typst, which is a new typesetting language with a concise syntax, powerful features, and extremely fast compilation speed.
       </>
     ),
   },