docs(readme): reduce a11y so coder v2 users don't stumble upon this (#501)

Author: ghuntley

README.md

@@ -1,44 +1,7 @@
-# Coder CLI
+# Coder v1 CLI
 
 [![GitHub Release](https://img.shields.io/github/v/release/cdr/coder-cli?color=6b9ded&include_prerelease=false)](https://github.com/cdr/coder-cli/releases)
 [![Documentation](https://godoc.org/cdr.dev/coder-cli?status.svg)](https://pkg.go.dev/cdr.dev/coder-cli/coder-sdk)
 
-> **Note**: This is the command line utility for [Coder Classic](https://coder.com/docs/coder).
-> If you are using [Coder OSS](https://coder.com/docs/coder-oss/latest), use [these instructions](https://coder.com/docs/coder-oss/latest/install)
-> to install the CLI.
+> **Note**: This is the command line utility for [Coder Classic](https://coder.com/docs/coder). If you are using [Coder v2 / Coder OSS](https://coder.com/docs/coder-oss/latest), use [these instructions](https://coder.com/docs/coder-oss/latest/install) to install the CLI.
 
-## Code
-
-As of v1.24.0, the Coder CLI is closed source. The code in this repo will remain
-as it was when closed on 20 October 2021. We will continue to use issues and
-releases for the time being, but this may change.
-
-We recommend using the SDK included in this repo until we publish the new Go SDK
-that's currently in progress.
-
-We will not accept any further pull requests.
-
-## Bugs & feature requests
-
-To report bugs and request features, please [open an issue](https://github.com/cdr/coder-cli/issues/new).
-
-## Installation
-
-### Homebrew (Mac, Linux)
-
-```sh
-brew install cdr/coder/coder-cli
-```
-
-### Download (Windows, Linux, Mac)
-
-Download the latest [release](https://github.com/cdr/coder-cli/releases):
-
-1. Click a release and download the tar file for your operating system (ex: coder-cli-linux-amd64.tar.gz)
-2. Extract the `coder` binary.
-
-## Usage
-
-View the usage documentation [here](./docs/coder.md).
-
-You can find additional Coder usage documentation on [coder.com/docs/cli](https://coder.com/docs/cli).