[book] fixes some references and other doc construction pbs * predefine order of js files in index generation, skip some files * fix some references to the base tutorial (recently changed) * other ReST fixes

Data model
==========

This chapter describes how you define a schema and how to make it evolves as the time goes.

.. toctree::
   :maxdepth: 1

   definition
   metadata
   baseschema
   define-workflows