Bug: README.md links 404 when you download repo as .ZIP

## OS Information

- `coder --version`: 0.5.1

## Steps to Reproduce

Open README.md file in preview mode or as RAW code. See the list of md files:

## Documentation

- [About Coder](./about.md#about-coder)
  - [Why remote development](about.md#why-remote-development)
  - [Why Coder](about.md#why-coder)
  - [What Coder is not](about.md#what-coder-is-not)
- [Templates](./templates.md)
  - [Manage templates](./templates.md#manage-templates)
  - [Persistent and ephemeral
    resources](./templates.md#persistent-and-ephemeral-resources)
  - [Variables](./templates.md#variables)
- [Workspaces](./workspaces.md)
  - [Create workspaces](./workspaces.md#create-workspaces)
  - [Connect with SSH](./workspaces.md#connect-with-ssh)
  - [Editors and IDEs](./workspaces.md#editors-and-ides)
  - [Workspace lifecycle](./workspaces.md#workspace-lifecycle)
  - [Updating workspaces](./workspaces.md#updating-workspaces)

## Expected

Clicking on each of these md files should open them.

## Actual

The files are missing.

## Logs

## Screenshot

<img width="487" alt="Screen Shot 2022-05-01 at 7 15 47 AM" src="https://user-images.githubusercontent.com/2022166/166145630-bde5eb0a-adc3-4d41-b8db-3d17321cedc6.png">




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