Allow indexingHint property in info.yml to generate json-ld block for SEO
https://github.com/IIIF/api/issues/438
e.g. indexingHint: "schema:author"
https://www.adamvowles.co.uk/blog/json-ld-local/
Should this be a separate lib to biiif? Perhaps presentation api and json-ld are plugins?
include link to json-ld block via seeAlso as per:
https://wellcomelibrary.org/iiif/b18035978/manifest https://wellcomelibrary.org/resource/schemaorg/b18035978
Include in page as per: view-source:https://wellcomelibrary.org/item/b18035978
example: https://gist.github.com/edsilv/8e0e6da9342585b824908efc40bd69d2
via: https://scrc.lib.ncsu.edu/sal_staging/catalog/ua023_015-005-bx0002-014-019#?c=0&m=0&s=0&cv=0&z=-648.8887%2C0%2C2097.7774%2C1189