refactor - moving "books" directory up to the top
Rationale: books yaml files are not really configuration for the app, they're really the source of data for the app, kind of like a database would be. I think moving them up to the top level makes for a more intuitive place to find these files. Plus, if we want extensions maintainers to be adding their own books to the system, this new organization scheme makes the process of adding a book yaml file just a tad easier for people who are unfamiliar with the inner workings of this app.
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