Combine dark and regular logo in README.md (#915)

README.md

@@ -5,7 +5,12 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/jenkinsci/kubernetes-operator "Go Report Card")](https://goreportcard.com/report/github.com/jenkinsci/kubernetes-operator)
 [![Gitter chat](https://badges.gitter.im/jenkinsci/kubernetes-operator.png)](https://gitter.im/jenkinsci/kubernetes-operator)
 
-![logo](/assets/jenkins_gopher_wide.png)
+<a href="">
+  <picture>
+     <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/jenkinsci/kubernetes-operator/master/assets/jenkins_gopher_wide_exp_dark.png">
+     <img src="https://raw.githubusercontent.com/jenkinsci/kubernetes-operator/master/assets/jenkins_gopher_wide_exp.png">
+  </picture>
+</a>
 
 ## What's the Jenkins Operator?