Fixed multiple bugs / WP5.3 compatible

【Contents of the fix】
■Fixed a bug in WP5.3 where the content builder in the theme options did not work.
■【Chrome】Support for automatic video playback policy
■Adjusted the style of the form of the plugin “Contact form 7”.
■Fixed a bug that the slider may not behave smoothly when the top page is displayed.

The following are the files that have been modified for this update.
【Fixed files】
admin/assets/js/cb.js
admin/assets/js/cb.min.js
assets/js/front-page.js
assets/js/front-page.min.js
front-page.php
functions.php
style.css