A reference doc for the `zed` cli would be very helpful for new users. Currently `zed --help` is the only way to learn about zed cli options. Examples of good docs on cli tools: [docker](https://docs.docker.com/reference/cli/docker/), [kubectl](https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#-strong-getting-started-strong-), and [terraform](https://developer.hashicorp.com/terraform/cli/commands).
