Multiple bug fixes

【Contents of fixes】
■Support WP5.6 (jQuery version upgrade)
■Fixed the bug that blog post list cannot be displayed on fixed pages.
■Fixed a bug that page navigation was not displayed on fixed pages.
■【Mac】Fixed a bug that caused Japanese and European characters to appear with different thicknesses when using some fonts.

The following files have been fixed in this update.
【Fixed files】
admin/css/editor-style.css
admin/inc/page.php
admin/js/my_script.js
comments.php
functions.php
functions/head.php
functions/ogp.php
functions/page_ads_and_post_list.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/css/pagebuilder.css
style.css

【Added files】
functions/page_cf2.php
js/jquery.easing.1.4.js

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