Removed the MainLatest feed from nuget.config (#666)

Author: Arlodotexe

nuget.config

@@ -2,7 +2,6 @@
   <packageSources>
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-    <add key="MainLatest" value="https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/CommunityToolkit-MainLatest/nuget/v3/index.json" protocolVersion="3" />
   </packageSources>
   <disabledPackageSources>
     <clear />