Remove Jenkins badges, authentication is now required

Author: uhafner

README.adoc

@@ -4,7 +4,6 @@
 
 = Jenkins Plugin Utilities
 
-image:https://ci.jenkins.io/job/Plugins/job/plugin-util-api-plugin/job/main/badge/icon?subject=Jenkins%20CI[Jenkins, link=https://ci.jenkins.io/job/Plugins/job/plugin-util-api-plugin/job/main/]
 image:https://github.com/jenkinsci/plugin-util-api-plugin/workflows/GitHub%20CI/badge.svg[GitHub Actions, link=https://github.com/jenkinsci/plugin-util-api-plugin/actions]
 image:https://img.shields.io/jenkins/plugin/i/plugin-util-api.svg?color=red[Jenkins Plugin Installslink=https://plugins.jenkins.io/warnings-ng]