* [FEATURE] Add theme support
This change allows users to select a theme for Authelia on start-up.
The default will continue to be the existing theme which is known as `light`.
Three new options are now also provided:
* `dark`
* `grey`
* `custom`
The `custom` theme allows users to specify a primary and secondary hex color code to be utilised to style the portal.
Co-authored-by: BankaiNoJutsu <lbegert@gmail.com>
* Add themes to integration tests
* Remove custom theme
* Fix linting issue in access_control_test.go
Co-authored-by: BankaiNoJutsu <lbegert@gmail.com>
* [MISC] Validate all sections of ACLs on startup
This change ensure that all sections of the `access_control` key are validated on startup.
* Change error format to clearly identify values
