zippy-8.x-1.x-dev/theme-settings.php

<?php
/**
 * @file
 * Add custom theme settings to the ZURB Foundation sub-theme.
 */

use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_FORM_ID_alter().
 * @param $form
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 */
function STARTER_form_system_theme_settings_alter(&$form, FormStateInterface $form_state) {

}