Cleanup command-line reference docs by renaming overview to envvars.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

docs/reference/overview.md

@@ -1,89 +0,0 @@
-<!--[metadata]>
-+++
-title = "Introduction to the CLI"
-description = "Introduction to the CLI"
-keywords = ["fig, composition, compose, docker, orchestration, cli,  reference"]
-[menu.main]
-parent = "smn_compose_cli"
-weight=-2
-+++
-<![end-metadata]-->
-
-
-# Introduction to the CLI
-
-This section describes the subcommands you can use with the `docker-compose` command.  You can run subcommand against one or more services. To run against a specific service, you supply the service name from your compose configuration. If you do not specify the service name, the command runs against all the services in your configuration.
-
-
-## Commands
-
-* [docker-compose Command](docker-compose.md)
-* [CLI Reference](index.md)
-
-
-## Environment Variables
-
-Several environment variables are available for you to configure the Docker Compose command-line behaviour.
-
-Variables starting with `DOCKER_` are the same as those used to configure the
-Docker command-line client. If you're using `docker-machine`, then the `eval "$(docker-machine env my-docker-vm)"` command should set them to their correct values. (In this example, `my-docker-vm` is the name of a machine you created.)
-
-### COMPOSE\_PROJECT\_NAME
-
-Sets the project name. This value is prepended along with the service name to the container container on start up. For example, if you project name is `myapp` and it includes two services `db` and `web` then compose starts containers named  `myapp_db_1` and `myapp_web_1` respectively.
-
-Setting this is optional. If you do not set this, the `COMPOSE_PROJECT_NAME`
-defaults to the `basename` of the project directory. See also the `-p`
-[command-line option](docker-compose.md).
-
-### COMPOSE\_FILE
-
-Specify the file containing the compose configuration. If not provided,
-Compose looks for a file named  `docker-compose.yml` in the current directory
-and then each parent directory in succession until a file by that name is
-found. See also the `-f` [command-line option](docker-compose.md).
-
-### COMPOSE\_API\_VERSION
-
-The Docker API only supports requests from clients which report a specific
-version. If you receive a `client and server don't have same version error` using
-`docker-compose`, you can workaround this error by setting this environment
-variable. Set the version value to match the server version.
-
-Setting this variable is intended as a workaround for situations where you need
-to run temporarily with a mismatch between the client and server version. For
-example, if you can upgrade the client but need to wait to upgrade the server.
-
-Running with this variable set and a known mismatch does prevent some Docker
-features from working properly. The exact features that fail would depend on the
-Docker client and server versions. For this reason, running with this variable
-set is only intended as a workaround and it is not officially supported.
-
-If you run into problems running with this set, resolve the mismatch through
-upgrade and remove this setting to see if your problems resolve before notifying
-support.
-
-### DOCKER\_HOST
-
-Sets the URL of the `docker` daemon. As with the Docker client, defaults to `unix:///var/run/docker.sock`.
-
-### DOCKER\_TLS\_VERIFY
-
-When set to anything other than an empty string, enables TLS communication with
-the `docker` daemon.
-
-### DOCKER\_CERT\_PATH
-
-Configures the path to the `ca.pem`, `cert.pem`, and `key.pem` files used for TLS verification. Defaults to `~/.docker`.
-
-### COMPOSE\_HTTP\_TIMEOUT
-
-Configures the time (in seconds) a request to the Docker daemon is allowed to hang before Compose considers
-it failed. Defaults to 60 seconds.
-
-
-## Related Information
-
-- [User guide](../index.md)
-- [Installing Compose](../install.md)
-- [Compose file reference](../compose-file.md)