Updates Gitlab runner documentation
This branch modifies the documentation around Gitlab runners. With the new prefixed publisher runners, we're now able to make runners namespaced to each team that wants to use this feature.
On December 29, GitLab will be migrating to the next generation Container Registry, which implements automatic garbage collection. See KB news article for edge cases in which you could need to rebuild a container after the migration.
This branch modifies the documentation around Gitlab runners. With the new prefixed publisher runners, we're now able to make runners namespaced to each team that wants to use this feature.