Use the `AshAuthentication.Secret` behaviour, rather than asking the user to explicitly set it in their application environment.
This is a breaking change that will require folks to change their resource config to look up the signing secret.
Closes#79.
Closes#77.
* Fix typo
* Password strategy requires a name
* Update documentation/getting_started/getting_started_01_basic_setup.md
Co-authored-by: James Harton <59449+jimsynz@users.noreply.github.com>
Co-authored-by: James Harton <59449+jimsynz@users.noreply.github.com>