Remove Contactform7 scripts from WP pages

functions.php

// Put this script in your functions.php
// I have very little pages, and I am sure it can be improved 
// or adjusted to suit your own project.

//Deregister the scripts.
function deregister_contact_form() {
  // You can put here all the pages where there is no contact form
    if ( ! is_page( 'contact' ) ) {
      remove_action('wp_enqueue_scripts', 'wpcf7_enqueue_scripts');
    }
}

//Add the action.
add_action( 'wp', 'deregister_contact_form');