Load the Contact Form 7 Stylesheet and JavaScript Only When Necessary (the Right Way). See http://cfxdesign.com/load-the-contact-form-7-stylesheet-and-javascript-only-when-necessary/

remove_cf7_assets-action_hook.php

<?php do_action('cf7_before_wp_head'); ?>

remove_cf7_assets.php

<?php

function remove_cf7_assets() {
  if(is_front_page()) {
    return;
  }
  add_filter('wpcf7_load_js', '__return_false');
  add_filter('wpcf7_load_css', '__return_false');
}
add_action('cf7_before_wp_head', 'remove_cf7_assets');

?>