theming Theming

Adjust the Nextcloud theme

Adjust the Nextcloud theme 2.5.0 agpl Nextcloud Theming customization https://github.com/nextcloud/server/issues OCA\Theming\Settings\Admin OCA\Theming\Settings\AdminSection OCA\Theming\Settings\Personal OCA\Theming\Settings\PersonalSection OCA\Theming\Migration\InitBackgroundImagesMigration OCA\Theming\Command\UpdateConfig