Update docfx.json to change to the standard feedback system

See https://aka.ms/ContentUserFeedback

Author: ghogen

subscriptions/docfx.json

@@ -35,9 +35,7 @@
     "externalReference": [],
     "globalMetadata": {
       "uhfHeaderId": "MSDocsHeader-VisualStudio",
-      "feedback_system": "GitHub",
-      "feedback_github_repo": "MicrosoftDocs/visualstudio-docs",
-      "feedback_product_url": "https://developercommunity2.visualstudio.com/search?space=8",
+      "feedback_system": "Standard",
       "breadcrumb_path": "/visualstudio/subscriptions/_breadcrumb/toc.json",
       "extendBreadcrumb": true,
       "manager": "shve",