Add schema.org structured data to site for search results

[bobbermac]

Resources:

• https://developers.google.com/search/docs/guides/search-gallery
• https://developers.google.com/search/docs/guides/prototype
• https://search.google.com/structured-data/testing-tool/u/0/

Features to support:

• Reviews - https://developers.google.com/search/docs/data-types/reviews
• TBD ...