docs: add Docker quickstart (#2875)

* Fix docker-compose file

* Add docker quickstart

docs/quickstart/docker.md

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+# Docker
+
+Coder with Docker has the following advantages:
+
+- Simple installation (everything is on a single box)
+- Workspace images are easily configured
+- Workspaces share resources for burst operations
+
+## Requirements
+
+- A single MacOS or Linux box
+- A running Docker daemon
+
+## Instructions
+
+1.  [Install and launch Coder](../install.md)
+
+    You may use `CODER_ACCESS_URL=http://localhost:7080` since we're using local
+    Docker workspaces exclusively. The rest of the guide will assume that this is your
+    access URL.
+
+    ```bash
+    coder server -a $CODER_ACCESS_URL
+    ```
+
+1.  Run `coder login http://localhost:7080` in a new terminal and follow the
+    interactive instructions to create your user.
+
+1.  Pull the example template:
+
+    ```bash
+    echo "docker" | coder templates init
+    cd docker
+    # You should see a `main.tf` file in this directory
+    ```
+
+1.  Open up `main.tf` in your preferred editor to edit the images
+
+    You can skip this step if you're fine with our default, generic OS images.
+
+    Search for the following section in `main.tf`:
+
+    ```hcl
+    ...
+    variable "docker_image" {
+     description = "Which Docker image would you like to use for your workspace?"
+     # The codercom/enterprise-* images are only built for amd64
+     default = "codercom/enterprise-base:ubuntu"
+     validation {
+         condition     = contains(["codercom/enterprise-base:ubuntu", "codercom/enterprise-node:ubuntu",
+                                 "codercom/enterprise-intellij:ubuntu", "codercom/enterprise-golang:ubuntu"], var.docker_image)
+         error_message = "Invalid Docker image!"
+     }
+    }
+    ...
+    ```
+
+    And edit the strings in `condition = contains([...])` and `default = ...`
+    with your preferred images.
+
+1.  Push up the template to Coder with `coder templates create`
+1.  Open the dashboard in your browser (http://localhost:7080) to create your
+    first workspace:
+
+    <img src="./images/quickstart/docker/login.png">
+
+    Then navigate to `Templates > docker > Create workspace`
+
+    <img src="./images/quickstart/docker/create-workspace.png">
+
+    Now wait a few moments for the workspace to build... After the first build
+    the image is cached and subsequent builds will take a few seconds.
+
+1.  All done!
+
+    <img src="./images/quickstart/docker/ides.png">
+
+    Open up a web application or [SSH in](../ides.md#ssh-configuration).
+
+## Next Steps
+
+- [Learn more about template configuration](../templates.md)
+- [Configure more IDEs](../ides/configuring-web-ides.md)

docs/quickstart/generic.md

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+## Prerequisites
+
+Please [install Coder](./install.md) before proceeding with the steps outlined in this article.
+
+## Creating your first template and workspace
+
+In a new terminal window, run the following to copy a sample template:
+
+```bash
+coder templates init
+```
+
+Follow the CLI instructions to select an example that you can modify for your
+specific usage (e.g., a template to **Develop code-server in Docker**):
+
+1. Navigate into your new templates folder and create your first template using
+   the provided command (e.g., `cd ./docker-code-server && coder templates create`)
+
+1. Answer the CLI prompts; when done, confirm that you want to create your template.
+
+Create a workspace using your template:
+
+```bash
+coder create --template="yourTemplate" <workspaceName>
+```
+
+Connect to your workspace via SSH:
+
+```bash
+coder ssh <workspaceName>
+```
+
+You can also access your workspace using the **access URL** you provided when
+deploying Coder (if you're using a temporary deployment and you opted to use
+Coder's tunnel, use the access URL you were provided). Log in with the admin
+credentials provided to you by Coder.
+
+![Coder Web UI with code-server](images/code-server.png)
+
+## Modifying templates
+
+You can edit the Terraform template as follows:
+
+```sh
+coder templates init
+cd gcp-linux # modify this line as needed to access the template
+vim main.tf
+coder templates update gcp-linux # updates the template
+```