* Convert MongoDB documentation from a top element of set to book
Convert all underlying elements as needed:
- books to parts or chapters
- articles to sections
Move the Predefined Constants page from the Installing/Configuring section to its own
Change the following xml:ids:
- book.mongodb to mongodb.mongodb
- set.mongodb to book.mongodb
- book.bson to mongodb.bson
* [skip-revcheck] Remove trailing whitespace
* Add extension membership
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Co-authored-by: haszi <haszika80@gmail.com>
haszi