If a plugin page is published from GitHub, it would be great to have a hyperlink for editing the page. Like on jenkins.io, this hyperlink could open the README edit page straight away by using links like https://github.com/jenkinsci/configuration-as-code-plugin/edit/master/README.md or https://github.com/jenkinsci/mailer-plugin/edit/master/README.adoc

This patch may need a way to determine whether the documentation page comes from Markdown or Asciidoc. Right now the Plugin Site backend does not expose such data