Add an info how to build remotely.

Resolves #3. Feel free to reopen or file a PR ^_^

Resolves #1

Fix CI

See merge request !1

Set the enable option for auto login to `true`.

Enable auto login and leave a hint that the default account does not
require a password.

This sets up the nixfiles repository for managing the Lenovo E15 honeybooks.
Documentation how to manage these nixfiles will be added soon after.