Fixed multiple bugs

■【iPhone】Fixed a bug where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■Fixed a Notice error regarding the handling of category colors displayed in PHP 7.4 environment.

The following are the files that have been modified for this update.

【Modified files】
archive-news.php
archive-work.php
css/footer-bar.css
footer-bar.php
front-page.php
functions/update_notifier.php
index.php
languages/ja.mo
languages/ja.po
single-news.php
single-work.php
single.php
style.css
widget/google_search.php

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

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