Remove preview warning

Author: href

README.md

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 # Kubernetes Cloud Controller Manager for cloudscale.ch
 
-> :warning: This is currently a preview and not yet ready for production.
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 Integrate your Kubernetes cluster with cloudscale.ch infrastructure, with our cloud controller manager (CCM).
 
 - Automatically provisions load balancers for [`LoadBalancer` services](https://kubernetes.io/docs/concepts/services-networking/service/#loadbalancer).