Generate a mapping of mid-level WikiProject categories to the WikiProjects contained in them as dictated by https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Council/Directory
Something like-
"Language and literature": [ "Wikipedia:WikiProject Linguistics", "Wikipedia:WikiProject Anthroponymy", "Wikipedia:WikiProject Classical Tamil", "Wikipedia:WikiProject Constructed languages", "Wikipedia:WikiProject Deaf", "Wikipedia:WikiProject Dravidian languages", . . .