Moved registry docs to registry subdirectory

docs/index.md

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+<!--[metadata]>
++++
+title = "Registry Overview"
+description = "High-level overview of the Registry"
+keywords = ["registry, on-prem, images, tags, repository, distribution"]
+aliases = ["/registry/overview/"]
+[menu.main]
+parent="smn_registry"
+weight=1
++++
+<![end-metadata]-->
+
+# Docker Registry
+
+## What it is
+
+The Registry is a stateless, highly scalable server side application that stores and lets you distribute Docker images.
+The Registry is open-source, under the permissive [Apache license](http://en.wikipedia.org/wiki/Apache_License).
+
+## Why use it
+
+You should use the Registry if you want to:
+
+ * tightly control where your images are being stored
+ * fully own your images distribution pipeline
+ * integrate image storage and distribution tightly into your in-house development workflow
+
+## Alternatives
+
+Users looking for a zero maintenance, ready-to-go solution are encouraged to head-over to the [Docker Hub](https://hub.docker.com), which provides a free-to-use, hosted Registry, plus additional features (organization accounts, automated builds, and more).
+
+Users looking for a commercially supported version of the Registry should look into [Docker Trusted Registry](https://docs.docker.com/docker-trusted-registry/overview/).
+
+## Requirements
+
+The Registry is compatible with Docker engine **version 1.6.0 or higher**.
+If you really need to work with older Docker versions, you should look into the [old python registry](https://github.com/docker/docker-registry).
+
+## TL;DR
+
+Start your registry
+
+    docker run -d -p 5000:5000 --name registry registry:2
+
+Pull (or build) some image from the hub
+
+    docker pull ubuntu
+
+Tag the image so that it points to your registry
+
+    docker tag ubuntu localhost:5000/myfirstimage
+
+Push it
+
+    docker push localhost:5000/myfirstimage
+
+Pull it back
+
+    docker pull localhost:5000/myfirstimage
+
+Now stop your registry and remove all data
+
+    docker stop registry && docker rm -v registry
+
+## Next
+
+You should now read the [detailed introduction about the registry](introduction.md), or jump directly to [deployment instructions](deploying.md).