Use AzDo feed for nightlies (#16982)

docs/DailyBuilds.md

@@ -13,13 +13,7 @@ If you want to download the latest daily build and use it in a project, then you
   <configuration>
       <packageSources>
           <clear />
-          <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
-          <add key="extensions" value="https://dotnetfeed.blob.core.windows.net/aspnet-extensions/index.json" />
-          <add key="entityframeworkcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframeworkcore/index.json" />
-          <add key="entityframework6" value="https://dotnetfeed.blob.core.windows.net/aspnet-entityframework6/index.json" />
-          <add key="aspnetcore-tooling" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore-tooling/index.json" />
-          <add key="aspnetcore" value="https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore/index.json" />
-          <add key="aspnet-blazor" value="https://dotnetfeed.blob.core.windows.net/aspnet-blazor/index.json" />
+          <add key="aspnetcore" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
           <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
       </packageSources>
   </configuration>