fix: revert markdown.hooks config back to top-level for Docusaurus 3.7.0

markdown.hooks is a 3.9+ feature and breaks the build on 3.7.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Xylo Dan

docusaurus.config.js

@@ -23,14 +23,9 @@ const config = {
   projectName: 'pyxdocu', // Usually your repo name.
 
   onBrokenLinks: 'throw',
+  onBrokenMarkdownLinks: 'warn', // TODO: migrate to markdown.hooks.onBrokenMarkdownLinks when upgrading to Docusaurus 3.9+
   onBrokenAnchors: 'warn',
 
-  markdown: {
-    hooks: {
-      onBrokenMarkdownLinks: 'warn',
-    },
-  },
-
   i18n: {
     defaultLocale: 'en',
     locales: ['en'],