Update content.md
Update content.md

Change absolute path to relative in cargo install
jetty-project/docker-docs,Bonitasoft-Community/docker_docs,nats-io/docker-docs,crate/docker-docs,Lightstreamer/docs,odoo/docker-docs,docker-library/docs,crate/docker-docs,tilosp-docker/library-docs,docker-library/docs,nats-io/docker-docs,avoinea/docs,docker-solr/docs,avoinea/docs,31z4/docs,docker-solr/docs,dinogun/docs,31z4/docs,Lightstreamer/docs,jetty-project/docker-docs,Bonitasoft-Community/docker_docs,infosiftr/docker-library-docs,infosiftr/docker-library-docs,odoo/docker-docs,dinogun/docs,tilosp-docker/library-docs