Remove internal feed from main sample nuget.config (#135)

Author: angelazhangmsft

Samples/nuget.config

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!-- This file was added for building in the CI pipeline. It is not used when building locally. -->
 <configuration>
     <packageRestore>
@@ -10,7 +10,6 @@
     <packageSources>
     <clear />
         <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-        <add key="Internal" value="https://pkgs.dev.azure.com/microsoft/ProjectReunion/_packaging/Project.Reunion.nuget.internal/nuget/v3/index.json" />
     </packageSources>
     <disabledPackageSources />
 </configuration>