Fix Breadcrumb element to use <ol> <li> in structure

The breadcrumbs output <a> but should be organized in an <ol> and <li> to follow correct HTML structure as outlined mozilla.org

Here’s a screenshot comparing Brick’s breadcrumbs element to The SEO Framework’s breadcrumb shortcode.

The reason I want to use Brick’s is because it has support for including taxonomy term in the breadcrumb structure and The SEO Framework doesn’t. But TSF does output the currect HTML structure.