* Document to either use a minimal configuration file or environment
variables to connect with a remote headscale instance.
* Document a workaround specific for headscale 0.23.0.
* Remove reference to ancient headscale version.
* Use `cli.insecure: true` or `HEADSCALE_CLI_INSECURE=1` to skip
certificate verification.
* Style and typo fixes
Ref: #2193
e7245856c5