fix: Update markdown filter to match nested files

Author: ongdisheng

.github/workflows/ci-docs.yml

@@ -57,7 +57,7 @@ jobs:
         uses: ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c
         with:
           format: 'csv'
-          filter: 'website/*.md'
+          filter: 'website/**/*.md'
 
       - name: Lint Markdown files
         if: steps.changed-md-files.outputs.all != ''