add container metadata back

Author: wuhanyumsft

.openpublishing.publish.config.json

@@ -67,7 +67,11 @@
       "ConceptualTOC": "docs-ref-conceptual/toc.yml",
       "ReferenceTOCUrl": "/javascript/api/toc.json",
       "ConceptualTOCUrl": "/javascript/azure/toc.json",
-      "OutputFolder": "docs-ref-autogen/overview/azure"
+      "OutputFolder": "docs-ref-autogen/overview/azure",
+      "ContainerPageMetadata": {
+        "langs": ["js"]
+      },
+      "ContainerPageYamlMime": "YamlMime:UniversalReference"
     }
   ],
   "DiffFolder": [