docs: remove unused nuget shields on readme

Author: Christoph Bühler

README.md

@@ -3,8 +3,6 @@
 ![Code Security Testing](https://github.com/buehler/dotnet-operator-sdk/workflows/Code%20Security%20Testing/badge.svg)
 ![.NET Release](https://github.com/buehler/dotnet-operator-sdk/workflows/.NET%20Release/badge.svg)
 ![.NET Testing](https://github.com/buehler/dotnet-operator-sdk/workflows/.NET%20Testing/badge.svg)
-[![Nuget](https://img.shields.io/nuget/v/KubeOps)](https://www.nuget.org/packages/KubeOps/)
-[![Nuget](https://img.shields.io/nuget/vpre/KubeOps?label=nuget%20prerelease)](https://www.nuget.org/packages/KubeOps/absoluteLatest)
 
 This is the repository of "KubeOps" - The dotnet Kubernetes Operator SDK.