Adding and deleting theme option items

【Contents of the fix】
■Added “Title” input field to TCD Theme Options > Blog > Header settings.
■Deleted the “Background Image (for mobile)” item in TCD Theme > Top Page (for smartphone) because it is unnecessary.

The following files have been modified for this update.

【Modified files】
admin/inc/blog.php
admin/inc/front_page_mobile.php
index.php
style.css