Adjusting the design and fixing the breadcrumb list

【Contents of modification】
■Removed the breadcrumb home icon from the top page.
■Adjusted the gray margin of the “Related Articles” section.
■Fixed a flaw in the structured markup of the breadcrumb list.

The following are the files that have been modified for this update.
【Corrected files】
header.php
content-single.php
breadcrumb.php

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