Fixed multiple bugs

【Contents of the fix】
■Fixed a bug where the front page did not have an h1 tag.
■Fixed a bug that the layout of the front page may be broken in IE11.
■Fixed the bug that an error may occur when using the theme option management function.
■Fixed an issue where the background color of the fixed footer bar in smartphone view did not reflect the theme options settings.

The following files have been modified for this update.
【Fixed files】
・header.php
・admin/inc/top.php
・admin/theme-options.php
・admin/inc/footer.php
・assets/js/front-page.js
・assets/js/front-page.min.js
・style.css

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