Improve empty state for the Dependency Proxy

History

Currently the Dependency Proxy has an empty state showing that there are no images. It would be more helpful to instruct users how to cache images in the empty state. See design attached to this image.

Related to #342979 (closed).

https://design.gitlab.com/regions/empty-states#goals

https://design.gitlab.com/product-foundations/illustration

http://gitlab-org.gitlab.io/gitlab-svgs/illustrations

Design proposal

Attached