Add SSL support/pager function

【Contents of the fix】
■Added SSL support for “Google Custom Search” widget.
■Added a function to adjust the pager display of the blog list page.
(TCD theme > Blog > Archive page settings now includes “Pager settings” and “Pager settings (for smartphones)” settings)

The following files have been modified for this update.

【Modified files】
admin/inc/blog.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
template-parts/navigation.php
widget/google_search.php

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