Add more system and integration connector documentation

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

content/docs/references/data/meta.json

@@ -5,7 +5,9 @@
     "dataset",
     "document",
     "driver",
+    "driver-mongo",
     "driver-nosql",
+    "driver-postgres",
     "driver-sql",
     "external-lookup",
     "field",