Jenkins has a mechanism known as "User Content", where administrators can place files inside $JENKINS_HOME/userContent, and these files are served from http://yourhost/jenkins/userContent. This can be thought of as a mini HTTP server to serve images, stylesheets, and other static resources that you can use from various description fields inside Jenkins.
- Note that these files are not subject to any access controls beyond requiring Overall/Read access.
- See Git userContent plugin for how to manage these files through a Git repository.