Fixed to resolve errors and adjust style for smartphone display

【Contents of the fix】
■Corrected a display collapse of the header bar that occurred in ver. 2.1 when displayed on a smartphone.
■Fixed the character encoding of some files (functions/ogp.php)
■Adjusted the style of the site when displayed on a smartphone.

The following are the files that have been modified for this update.
【Corrected files】
admin/theme-options.php
functions/head.php
functions/ogp.php
responsive.css
style.css

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