Switch from GH doc issue feedback to new feedback control (#3248)

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Author: Mikejo5000

docs/docfx.json

@@ -35,7 +35,7 @@
     "globalMetadata": {
       "ms.service": "nuget",
       "uhfHeaderId": "MSDocsHeader-DotNet",
-      "feedback_system": "GitHub",
+      "feedback_system": "Standard",
       "feedback_github_repo": "NuGet/docs.microsoft.com-nuget",
       "feedback_product_url": "https://github.com/NuGet/Home/issues/",
       "breadcrumb_path": "~/_breadcrumb/toc.yml",