chore: Remove unused feeds

nuget.config

@@ -3,7 +3,5 @@
   <packageSources>
     <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />
     <add key="platform.uno dev" value="https://uno-platform.pkgs.visualstudio.com/Uno%20Platform/_packaging/unoplatformdev/nuget/v3/index.json" />
-    <add key="platform.uno features" value="https://pkgs.dev.azure.com/uno-platform/1dd81cbd-cb35-41de-a570-b0df3571a196/_packaging/Features%40Local/nuget/v3/index.json" />
-    <add key="platform.uno 5x" value="https://pkgs.dev.azure.com/uno-platform/1dd81cbd-cb35-41de-a570-b0df3571a196/_packaging/dev-uno5/nuget/v3/index.json" />
   </packageSources>
 </configuration>