There are a couple of new configs to define the name of the instance.
The more important is `APP_SLOGAN`. It permits to configure a slogan for the site and it is optional.
The other is `APP_DISPLAY_NAME_FORMAT` and permits to customize the aspect of the full display name for the instance used in some parts of the UI as:

- Title page.
- Homepage head title.
- Open Graph site and title meta tags.

Its default value is `APP_NAME: APP_SLOGAN`.
The config `APP_DISPLAY_NAME_FORMAT` is used only if `APP_SLOGAN` is set otherwise the full display name shows only `APP_NAME` value.
