refactor: up version

docusaurus.config.ts

@@ -21,8 +21,12 @@ const config: Config = {
   projectName: 'fe-docs', // Usually your repo name.
 
   onBrokenLinks: 'throw',
-  onBrokenMarkdownLinks: 'warn',
-
+  //onBrokenMarkdownLinks: 'warn', // FIXME: deprecated in v.4, remove it
+  markdown: {
+    hooks: {
+      onBrokenMarkdownLinks: "warn"
+    }
+  },
   // Even if you don't use internationalization, you can use this field to set
   // useful metadata like html lang. For example, if your site is Chinese, you
   // may want to replace "en" with "zh-Hans".