Multiple bug fixes

【Contents of the fix】
■Changed the display specification of the breadcrumb list on the blog post detail page.
(For articles belonging to a parent category and its child categories, the display will be Home Icon > Blog > Parent Category > Child Category > Article Title.)
■【iPhone】Fixed a bug where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■Page builder has been updated.
・【Firefox、IE】 Fixed the problem of Google map display being unstable.
・Fixed an issue with the editor switching in WordPress 5.5 and adjusted the CSS.
・Fixed a bug that the checkbox of the block border was removed when duplicating a block.
・Fixed other minor bugs.
■Adjusted the layout of the “Blog List” contents on the top page.

The following files have been modified for this update.

【Modified file】
css/footer-bar.css
functions/update_notifier.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/modules/googlemap.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
style.css
template-parts/breadcrumb.php
template-parts/footer-bar.php
widget/google_search.php

【Added files】
img/common/hatenabookmark-logomark.svg