Document schema.org configuration feature and process

[julesies]

Descriptive summary of request

We learned about this at SC18 where @geekscruff is mapping worktype fields to schema.org properties.

Here is the file https://github.com/samvera/hyrax/blob/master/config/schema_org.yml

It doesn't appear to have any documentation and needs the config file to work? We don't get the file automatically it appears.

[ghost]

By default Hyrax has this file and uses the mapping defined in the file (for basic_metadata properties) to embed schema.org metadata into pages. The file sits in Hyrax, but can be overriden/added to by having the same file in the local application.

Agree that some doco would be good :)