Functional additions/fixing bugs/eliminating functions

【Contents of the fix】
■Added the function “Copy the title and URL of this article”.
■Changed the specification of the ranking display when the access of the article is not counted.
■Abolished the Google+ button.

The following files have been modified for this update.
【Fixed files】
admin/inc/basic.php
admin/inc/blog.php
functions.php
functions/page_ranking.php
languages/ja.mo
languages/ja.po
page-ranking.php
single.php
style.css
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php
【Added files】
js/copy_title_url.js