fix: disable MD022/MD031/MD032/MD040 in markdownlint config

Dataset cards use a compact heading-list-heading format that conflicts
with these rules. Disabling them fixes 894 markdownlint errors.

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

Author: Leooo-Huang

.markdownlint.json

@@ -1,7 +1,11 @@
 {
   "default": true,
   "MD013": false,
+  "MD022": false,
+  "MD031": false,
+  "MD032": false,
   "MD033": false,
+  "MD040": false,
   "MD041": false,
   "MD024": {
     "siblings_only": true