Update JSON+LD output to be full graphs

Yoast recently released an excellent resource on building out schema.org JSON+LD graphs.

https://developer.yoast.com/schema-documentation/specification/

In short the full graph of content for a page should be present on every page, for example: Organisation > Website > Webpage > Collection > BlogPosts

Start by reviewing the repository's current JSON+LD output and the linked Yoast schema documentation. Define the full graph expected on each page, including Organisation, Website, Webpage, Collection, and BlogPosts, then verify that the generated output contains those connected entities.

Written by the indexing model from the issue text.