Update docfx.json

Author: mattwojo

docs/docfx.json

@@ -38,7 +38,7 @@
       "searchScope": [
         "windows-toolkit"
       ],
-      "feedback_system": "GitHub",
+      "feedback_system": "None",
       "feedback_github_repo": "MicrosoftDocs/WindowsCommunityToolkitDocs",
       "feedback_product_url": "https://github.com/windows-toolkit/WindowsCommunityToolkit/issues",
       "uhfHeaderId": "MSDocsHeader-Windows",