Update index.zh.js

Author: xuyanshi

src/pages/index.zh.js

@@ -2,6 +2,6 @@ import React from 'react';
 
 import IndexPage from '../components/IndexPage';
 
-const Index = () => <IndexPage lang="zh" title="全栈公开课2022" />;
+const Index = () => <IndexPage lang="zh" title="全栈公开课" />;
 
 export default Index;