Issue #3261349 by gaurav.kapoor: Added example snippet in README.

 * Configure the ignition error handler at (/admin/config/development/ignition).

 * 'Enable' configuration can be used to toggle enabling/disabling.

 * 'Dark Mode' configuration can be used to enable Dark Mode for the UI.

 * Make sure ignition module is either uninstalled in production or marked

   as disabled from the configuration. You can also add a snippet like this

   in you settings.php file to achieve the same.

    if (SITE_IS_PROD) {

      $config['ignition.settings']['enable'] = FALSE;

    }

   For Acquia environments, you can use following snippet.

    if (isset($_ENV['AH_SITE_ENVIRONMENT']) && $_ENV['AH_SITE_ENVIRONMENT'] == 'prod') {

      $config['ignition.settings']['enabled'] = FALSE;

    }

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