Rather than textbook of ideas, it should be intereactive QA textbooks. Here is manual explaining how they can be generated.
In short, we need all relevant questions on one topic, a lot of good answers and moderators who would systemize the knowledge so that such topic is easy to filter by category (eg data, causes, context, solutions) and veracity (fact, opinions, speculations)
The truth is that for no topic we have enough quality content yet to call it a textbook. It would be great to produce such prototype by end of November 2017. It's a big challenge. Would you like to take part?