Answer a question from the help center (POST form)

Runs the help center search on a question or a few words and returns the best guides and questions in full, as markdown. An empty list means no guide covers it, which usually means Grape does not do that yet; meta.roadmap is where to ask for it. This is what the chat in the Grape apps reads when it is asked about Grape itself. Identical to the GET operation; the query arguments move into a JSON body.