Move docs to docs.xfce.org
https://goodies.xfce.org/projects/panel-plugins/xfce4-windowck-plugin is read-only, out of date and deprecated, so docs should be moved to new website.
https://goodies.xfce.org/projects/panel-plugins/xfce4-windowck-plugin is read-only, out of date and deprecated, so docs should be moved to new website.