Cover all global settings for the application, which are partially covered already in https://doc.ezplatform.com/en/1.12/guide/best_practices/#ez-platform-configuration

The result should be something like in 4.x version : https://doc.ez.no/eZ-Publish/Technical-manual/4.x/Reference/Configuration-files, but distributed among relevant topics in the guide (possibly with a central reference list).