Feed cleanup (#667)

Switch away from blob feeds.

NuGet.config

@@ -6,11 +6,10 @@
   </fallbackPackageFolders>
   <packageSources>
     <clear />
-    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
-    <add key="dotnet-coreclr" value="https://dotnetfeed.blob.core.windows.net/dotnet-coreclr/index.json" />
-    <add key="dotnet-windowsdesktop" value="https://dotnetfeed.blob.core.windows.net/dotnet-windowsdesktop/index.json" />
+    <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
+    <add key="dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
+    <add key="dotnet5-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5-transport/nuget/v3/index.json" />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="arcade-validation" value="https://dotnetfeed.blob.core.windows.net/arcade-validation/index.json" />
   </packageSources>
   <disabledPackageSources>
     <clear />