How to add jQuery from CDN in Wordpress or how to disable jQuery

functions.php

function disable_jQuery() {
  if(!is_admin()){
    wp_deregister_script('jquery');
  }
}

function add_jQuery_from_cdn(){
  if(!is_admin()){
    wp_deregister_script('jquery');
    wp_register_script('jquery', 'https://code.jquery.com/jquery-2.2.4.min.js', null, null, true);
    wp_enqueue_script('jquery');
  }
}

// Disable jQuery
add_action('wp_enqueue_scripts', 'disable_jQuery');

// Replace local jQuery with CDN version
add_action('wp_enqueue_scripts', 'add_jQuery_from_cdn');