Fixed multiple bugs

【Contents of the fix】
■Fixed a bug that the display was broken when the catchphrase and description were set in the “Archive Page Settings” of each term in the medical subject category.
■Fixed a bug in which unnecessary descriptions were sometimes displayed under the footer when viewing from a smartphone.
■Changed h2 tags to h1 tags in the logo section.

The following are the files that have been modified for this update.
【Corrected files】
・css/responsive.css
・functions/logo.php
・functions/seo.php
・style.css