Revert "Initial links for Docker Hub rename"

This reverts commit 2819677c215bd409b4ce4da51f0ddfb303760796.

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)

docs/sources/reference/commandline/cli.md

@@ -739,9 +739,9 @@ Running `docker ps` showing 2 linked containers.
     Pull an image or a repository from the registry
 
 Most of your images will be created on top of a base image from the
-[Docker Hub](https://hub.docker.com) registry.
+[Docker.io](https://index.docker.io) registry.
 
-[Docker Hub](https://hub.docker.com) contains many pre-built images that you
+[Docker.io](https://index.docker.io) contains many pre-built images that you
 can `pull` and try without needing to define and configure your own.
 
 To download a particular image, or set of images (i.e., a repository),
@@ -760,7 +760,7 @@ use `docker pull`:
 
     Push an image or a repository to the registry
 
-Use `docker push` to share your images to the [Docker Hub](https://hub.docker.com)
+Use `docker push` to share your images to the [Docker.io](https://index.docker.io)
 registry or to a self-hosted one.
 
 ## restart
@@ -1116,7 +1116,7 @@ It is used to create a backup that can then be used with
 
 ## search
 
-Search [Docker Hub](https://hub.docker.com) for images
+Search [Docker.io](https://index.docker.io) for images
 
     Usage: docker search TERM
 
@@ -1126,8 +1126,8 @@ Search [Docker Hub](https://hub.docker.com) for images
       -s, --stars=0          Only displays with at least xxx stars
       --automated=false      Only show automated builds
 
-See [*Find Public Images on Docker Hub*](
-/userguide/dockerrepos/#find-public-images-on-docker-hub) for
+See [*Find Public Images on Docker.io*](
+/userguide/dockerrepos/#find-public-images-on-dockerio) for
 more details on finding shared images from the commandline.
 
 ## start