Image Registries is missing Docker Trusted Registry and docker-distribution

[banjot]

Docker Trusted Registry is an on-prem, behind-your-firewall, enterprise registry for Docker container images built on the docker-distribution project; adding authentication, authorization, auditing, and web-based management.
docs: https://docs.docker.com/docker-trusted-registry/

Docker-distribution is an open source project providing a container registry for on-premise environments to tightly control the availability and accessibility of images. This project runs the a v2 registry and is compatible with Docker 1.6 and beyond.

software: https://github.com/docker/distribution
docs: https://docs.docker.com/registry/

in full disclosure, I work for Docker.

[schoefmann]

While https://github.com/programmableinfrastructure/p24e.io/blob/master/_tech/docker-hub.md already mentions the Docker Trusted Registry, you are invited to extend that page, possibly detailing the difference between the 3 options (Hub, DTR, private registry).
It might then make sense to rename it from docker-hub.md to docker-registries.md and change the website link.
The tech pages are currently all very short, it doesn't need to be that way if you want to write a bit more (which the topic of registries certainly warrants).