add missing Breadcrumb JsonLD format

add the missing Breadcrumb JsonLD format for display in search engines.

Documentation :

• https://schema.org/BreadcrumbList
• https://developers.google.com/search/docs/data-types/breadcrumb?hl=fr

Test tool :

• https://search.google.com/structured-data/testing-tool?hl=fr#

Example :

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [{
    "@type": "ListItem",
    "position": 1,
    "name": "Books",
    "item": "https://example.com/books"
  },{
    "@type": "ListItem",
    "position": 2,
    "name": "Authors",
    "item": "https://example.com/books/authors"
  },{
    "@type": "ListItem",
    "position": 3,
    "name": "Ann Leckie",
    "item": "https://example.com/books/authors/annleckie"
  },{
    "@type": "ListItem",
    "position": 4,
    "name": "Ancillary Justice",
    "item": "https://example.com/books/authors/ancillaryjustice"
  }]
}
</script>