Fixed bug/removed setting item

■【iPhone】Fixed a bug where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■Removed unnecessary setting items (duplicated items) in the theme options.

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

【Modified files】
admin/inc/blog.php
admin/inc/information.php
admin/theme-options.php
css/footer-bar.css
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
template-parts/footer-bar.php

【Added files】
img/hatenabookmark-logomark.svg

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