Schema markup generator

Builds Organization JSON-LD — the piece of structured data that tells search engines which entity a site belongs to, and the one most worth having.

The `sameAs` list is what does the real work. It links the site to its social and directory profiles, which is how a search engine establishes that they are all the same organisation rather than several with similar names. That entity understanding feeds the knowledge panel and helps disambiguate a brand from a common word. Two practical rules: put this on the homepage only rather than every page, since it describes the organisation and not the document, and give every other structured-data block a `publisher` that references it by `@id` rather than repeating the whole organisation on every page.