chore: bump docs-extensions-and-macros to v5 (#68)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: kbatuigas

package-lock.json

@@ -17,6 +17,6 @@
   },
   "homepage": "https://github.com/redpanda-data/api-docs#readme",
   "dependencies": {
-    "@redpanda-data/docs-extensions-and-macros": "^4.0.0"
+    "@redpanda-data/docs-extensions-and-macros": "^5.0.0"
   }
 }