Merge "Remove static _book.yaml in favor of generated version...

Merge "Remove static _book.yaml in favor of generated version (samples_navtree_data.cs)." into mnc-mr-docs am: 2974e94e am: 1c1a85bc
am: 61a6d2f3

* commit '61a6d2f3':
  Remove static _book.yaml in favor of generated version (samples_navtree_data.cs).

Change-Id: I9086d484fc307a7c1e39a06c317383d7b2e9c7be