Restructure headscale documentation (#2163)

* Setup mkdocs-redirects

* Restructure existing documentation

* Move client OS support into the documentation

* Move existing Client OS support table into its own documentation page
* Link from README.md to the rendered documentation
* Document minimum Tailscale client version

* Reuse CONTRIBUTING.md" in the documentation

* Include "CONTRIBUTING.md" from the repository root
* Update FAQ and index page and link to the contributing docs

* Add configuration reference

* Add a getting started page and explain the first steps with headscale

* Use the existing "Using headscale" sections and combine them into a
  single getting started guide with a little bit more explanation.
* Explain how to get help from the command line client.
* Remove duplicated sections from existing installation guides

* Document requirements and assumptions

* Document packages provided by the community

* Move deb install guide to official releases

* Move manual install guide to official releases

* Move container documentation to setup section

* Move sealos documentation to cloud install page

* Move OpenBSD docs to build from source

* Simplify DNS documentation

* Add sponsor page

* Add releases page

* Add features page

* Add help page

* Add upgrading page

* Adjust mkdocs nav

* Update wording

Use the term headscale for the project, Headscale on the beginning of a
sentence and `headscale` when refering to the CLI.

* Welcome to headscale

* Link to existing documentation in the FAQ

* Remove the goal header and use the text as opener

* Indent code block in OIDC

* Make a few pages linter compatible

Also update ignored files for prettier

* Recommend HTTPS on port 443

Fixes: #2164

* Use hosts in acl documentation

thx @efficacy38 for noticing this

Ref: #1863

* Use mkdocs-macros to set headscale version once
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# Connecting an Android client
This documentation has the goal of showing how a user can use the official Android [Tailscale](https://tailscale.com) client with headscale.
## Installation
Install the official Tailscale Android client from the [Google Play Store](https://play.google.com/store/apps/details?id=com.tailscale.ipn) or [F-Droid](https://f-droid.org/packages/com.tailscale.ipn/).
## Configuring the headscale URL
- Open the app and select the settings menu in the upper-right corner
- Tap on `Accounts`
- In the kebab menu icon (three dots) in the upper-right corner select `Use an alternate server`
- Enter your server URL (e.g `https://headscale.example.com`) and follow the instructions

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# Connecting an Apple client
This documentation has the goal of showing how a user can use the official iOS and macOS [Tailscale](https://tailscale.com) clients with headscale.
!!! info "Instructions on your headscale instance"
An endpoint with information on how to connect your Apple device
is also available at `/apple` on your running instance.
## iOS
### Installation
Install the official Tailscale iOS client from the [App Store](https://apps.apple.com/app/tailscale/id1470499037).
### Configuring the headscale URL
- Open Tailscale and make sure you are _not_ logged in to any account
- Open Settings on the iOS device
- Scroll down to the `third party apps` section, under `Game Center` or `TV Provider`
- Find Tailscale and select it
- If the iOS device was previously logged into Tailscale, switch the `Reset Keychain` toggle to `on`
- Enter the URL of your headscale instance (e.g `https://headscale.example.com`) under `Alternate Coordination Server URL`
- Restart the app by closing it from the iOS app switcher, open the app and select the regular sign in option
_(non-SSO)_. It should open up to the headscale authentication page.
- Enter your credentials and log in. Headscale should now be working on your iOS device.
## macOS
### Installation
Choose one of the available [Tailscale clients for macOS](https://tailscale.com/kb/1065/macos-variants) and install it.
### Configuring the headscale URL
#### Command line
Use Tailscale's login command to connect with your headscale instance (e.g `https://headscale.example.com`):
```
tailscale login --login-server <YOUR_HEADSCALE_URL>
```
#### GUI
- ALT + Click the Tailscale icon in the menu and hover over the Debug menu
- Under `Custom Login Server`, select `Add Account...`
- Enter the URL of your headscale instance (e.g `https://headscale.example.com`) and press `Add Account`
- Follow the login procedure in the browser

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# Connecting a Windows client
This documentation has the goal of showing how a user can use the official Windows [Tailscale](https://tailscale.com) client with headscale.
!!! info "Instructions on your headscale instance"
An endpoint with information on how to connect your Windows device
is also available at `/windows` on your running instance.
## Installation
Download the [Official Windows Client](https://tailscale.com/download/windows) and install it.
## Configuring the headscale URL
Open a Command Prompt or Powershell and use Tailscale's login command to connect with your headscale instance (e.g
`https://headscale.example.com`):
```
tailscale login --login-server <YOUR_HEADSCALE_URL>
```
Follow the instructions in the opened browser window to finish the configuration.
## Troubleshooting
### Unattended mode
By default, Tailscale's Windows client is only running when the user is logged in. If you want to keep Tailscale running
all the time, please enable "Unattended mode":
- Click on the Tailscale tray icon and select `Preferences`
- Enable `Run unattended`
- Confirm the "Unattended mode" message
See also [Keep Tailscale running when I'm not logged in to my computer](https://tailscale.com/kb/1088/run-unattended)
### Failing node registration
If you are seeing repeated messages like:
```
[GIN] 2022/02/10 - 16:39:34 | 200 | 1.105306ms | 127.0.0.1 | POST "/machine/redacted"
```
in your headscale output, turn on `DEBUG` logging and look for:
```
2022-02-11T00:59:29Z DBG Machine registration has expired. Sending a authurl to register machine=redacted
```
This typically means that the registry keys above was not set appropriately.
To reset and try again, it is important to do the following:
1. Shut down the Tailscale service (or the client running in the tray)
2. Delete Tailscale Application data folder, located at `C:\Users\<USERNAME>\AppData\Local\Tailscale` and try to connect again.
3. Ensure the Windows node is deleted from headscale (to ensure fresh setup)
4. Start Tailscale on the Windows machine and retry the login.

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# Getting started
This page helps you get started with headscale and provides a few usage examples for the headscale command line tool
`headscale`.
!!! note "Prerequisites"
* Headscale is installed and running as system service. Read the [setup section](../setup/requirements.md) for
installation instructions.
* The configuration file exists and is adjusted to suit your environment, see
[Configuration](../ref/configuration.md) for details.
* The Tailscale client is installed, see [Client and operating system support](../about/clients.md) for more
information.
## Getting help
The `headscale` command line tool provides built-in help. To show available commands along with their arguments and
options, run:
=== "Native"
```shell
# Show help
headscale help
# Show help for a specific command
headscale <COMMAND> --help
```
=== "Container"
```shell
# Show help
docker exec -it headscale \
headscale help
# Show help for a specific command
docker exec -it headscale \
headscale <COMMAND> --help
```
## Manage users
In headscale, a node (also known as machine or device) is always assigned to a specific user, a
[tailnet](https://tailscale.com/kb/1136/tailnet/). Such users can be managed with the `headscale users` command. Invoke
the built-in help for more information: `headscale users --help`.
### Create a user
=== "Native"
```shell
headscale users create <USER>
```
=== "Container"
```shell
docker exec -it headscale \
headscale users create <USER>
```
### List existing users
=== "Native"
```shell
headscale users list
```
=== "Container"
```shell
docker exec -it headscale \
headscale users list
```
## Register a node
One has to register a node first to use headscale as coordination with Tailscale. The following examples work for the
Tailscale client on Linux/BSD operating systems. Alternatively, follow the instructions to connect
[Android](connect/android.md), [Apple](connect/apple.md) or [Windows](connect/windows.md) devices.
### Normal, interactive login
On a client machine, run the `tailscale up` command and provide the FQDN of your headscale instance as argument:
```shell
tailscale up --login-server <YOUR_HEADSCALE_URL>
```
Usually, a browser window with further instructions is opened and contains the value for `<YOUR_MACHINE_KEY>`. Approve
and register the node on your headscale server:
=== "Native"
```shell
headscale nodes register --user <USER> --key <YOUR_MACHINE_KEY>
```
=== "Container"
```shell
docker exec -it headscale \
headscale nodes register --user <USER> --key <YOUR_MACHINE_KEY>
```
### Using a preauthkey
It is also possible to generate a preauthkey and register a node non-interactively. First, generate a preauthkey on the
headscale instance. By default, the key is valid for one hour and can only be used once (see `headscale preauthkeys
--help` for other options):
=== "Native"
```shell
headscale preauthkeys create --user <USER>
```
=== "Container"
```shell
docker exec -it headscale \
headscale preauthkeys create --user <USER>
```
The command returns the preauthkey on success which is used to connect a node to the headscale instance via the
`tailscale up` command:
```shell
tailscale up --login-server <YOUR_HEADSCALE_URL> --authkey <YOUR_AUTH_KEY>
```