* Link to stable and development docs in the README
* Add Tailscale SSH and autogroup:nonroot to features page
* Use @ when referencing users in policy
* Remove unmaintained headscale-webui
The project seems to be unmaintained (last commit: 2023-05-08) and it
only supports Headscale 0.22 or earlier.
* Use full image URL in container docs
This makes it easy to switch the container runtime from docker <->
podman.
* Remove version from docker-compose.yml example
This is now deprecated and yields a warning.
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