Multiple bug fixes

【Contents of fixes】
■Added support for WP5.6 (compatible with jQuery version upgrade)
■Fixed a bug that the text size (for mobile) setting of the description of the fixed page “Landing Page” template “Arrow Content” is not reflected.
■Fixed a bug that FAQ contents are not displayed in fixed page template LP.

The following are the files that have been modified for this update.
【Modified file】
admin/js/my_script.js
css/responsive.css
functions.php
functions/head.php
functions/ogp.php
js/header_fix.js
js/header_fix_mobile.js
page-lp.php
style.css

【Added files】
js/jquery.easing.1.4.js

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