Use consolidated nuget feed

Author: jimmylewis

nuget.config

@@ -2,22 +2,6 @@
 <configuration>
   <packageSources>
     <clear />
-    <add key="dotnet-public" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json" />
-    <add key="dotnet-myget-legacy" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/myget-legacy/nuget/v3/index.json" />
-    <add key="vs" value="https://pkgs.dev.azure.com/azure-public/vside/_packaging/msft_consumption/nuget/v3/index.json" />
+    <add key="libman" value="https://pkgs.dev.azure.com/azure-public/vswebtools/_packaging/libman/nuget/v3/index.json" />
   </packageSources>
-
-  <packageSourceMapping>
-    <packageSource key="dotnet-public">
-      <package pattern="*" />
-    </packageSource>
-    <packageSource key="dotnet-myget-legacy">
-      <package pattern="Microsoft.Extensions.CommandLineUtils.Sources" />
-    </packageSource>
-    <packageSource key="vs">
-      <package pattern="Microsoft.Test.Apex.VisualStudio" />
-      <package pattern="Microsoft.VisualStudio.Internal.MicroBuild" />
-      <package pattern="Microsoft.WebTools.Languages.*" />
-    </packageSource>
-  </packageSourceMapping>
 </configuration>