as a patron I want to know what the different types and subtypes of references mean

Idea from Stephen:
Idea: in ware there are field names without clear meaning eg. Page Overview -> Reference Type -> named, footnote, content, general. Following each term, an i with a circle around it, click for a pop-up providing more context what terms mean.

Start by running the interactive IARI JSON viewer and locating the Page Overview section where Reference Type is displayed. Review how the named, footnote, content, and general types and subtypes are rendered. Done means each term has an information control that opens a pop-up with clear context.

Written by the indexing model from the issue text.