Improve file template discoverability
Instance level https://gitlab.com/gitlab-org/gitlab-ee/issues/5306 and group level https://gitlab.com/gitlab-org/gitlab-ee/issues/5987 templates are hard to discover. We should make this feature easier to come across.
Proposal
Add an empty state if no custom templates are configured
What does success look like, and how can we measure that?
We can measure the number of groups and instances with templates before and after.