Update docfx.json

Adding needed metadata for the search on surfacing docs in support channels.

Author: VesaJuvonen

docs/docfx.json

@@ -45,7 +45,8 @@
       "ms.prod": "sharepoint",
       "feedback_system": "GitHub",
       "feedback_github_repo": "SharePoint/sp-dev-docs",
-      "feedback_product_url": "https://aka.ms/spdev-uservoice"
+      "feedback_product_url": "https://aka.ms/spdev-uservoice",
+      "search.appverid": "MET150"
     },
     "fileMetadata": {
       "ms.technology":{