functions.php

<?php
/**
 * Sage includes
 *
 * The $sage_includes array determines the code library included in your theme.
 * Add or remove files to the array as needed. Supports child theme overrides.
 *
 * Please note that missing files will produce a fatal error.
 *
 * @link https://github.com/roots/sage/pull/1042
 */
$sage_includes = [
  'lib/assets.php',    // Scripts and stylesheets
  'lib/extras.php',    // Custom functions
  'lib/setup.php',     // Theme setup
  'lib/titles.php',    // Page titles
  'lib/wrapper.php',   // Theme wrapper class
  'lib/customizer.php', // Theme customizer
  'lib/wp_bootstrap_navwalker.php'
];

foreach ($sage_includes as $file) {
  if (!$filepath = locate_template($file)) {
    trigger_error(sprintf(__('Error locating %s for inclusion', 'sage'), $file), E_USER_ERROR);
  }

  require_once $filepath;
}
unset($file, $filepath);

include_once('advanced-custom-fields/acf.php');

define( 'ACF_LITE', true );

if(function_exists("register_field_group"))
{
	register_field_group(array (
		'id' => 'acf_page-options',
		'title' => 'Page Options',
		'fields' => array (
			array (
				'key' => 'field_570922840974f',
				'label' => 'Page Image',
				'name' => 'page_image',
				'type' => 'image',
				'save_format' => 'object',
				'preview_size' => 'thumbnail',
				'library' => 'all',
			),
			array (
				'key' => 'field_570922af09750',
				'label' => 'Dark Mode',
				'name' => 'dark_mode',
				'type' => 'checkbox',
				'instructions' => 'Turn on dark mode. This will invert the colors in the navbar.',
				'choices' => array (
					'on' => 'On',
				),
				'default_value' => '',
				'layout' => 'vertical',
			),
		),
		'location' => array (
			array (
				array (
					'param' => 'post_type',
					'operator' => '==',
					'value' => 'page',
					'order_no' => 0,
					'group_no' => 0,
				),
			),
		),
		'options' => array (
			'position' => 'normal',
			'layout' => 'default',
			'hide_on_screen' => array (
				0 => 'the_content',
			),
		),
		'menu_order' => 0,
	));
}