Move nuget.config to root folder

Author: andreas-valtech

…imizelyTestContainers.Tests/nuget.config nuget.configtest/OptimizelyTestContainers.Tests/nuget.config renamed to nuget.config test/OptimizelyTestContainers.Tests/nuget.config renamed to nuget.config

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
+    <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="Optimizely" value="https://api.nuget.optimizely.com/v3/index.json" />
+    <add key="optimizely" value="https://api.nuget.optimizely.com/v3/index.json" />
   </packageSources>
 </configuration>