Default theme implementation for a system settings form.
This template will be used when a system config form specifies 'config_form' as its #theme callback. Otherwise, by default, system config forms will be themed by form.html.twig. This does not alter the appearance of a form at all, but is provided as a convenience for themers.
Available variables:
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https://api.drupal.org/api/drupal/core!modules!system!templates!system-config-form.html.twig/8.1.x