[doc] Restructure the documentation * Create a new index file * Move the sphinx configuration files do the documentation root * Move book/README to dev/documenting.rst * Move book/mode_plan.py to tools/ * Move book/en/images to images * Move book/en/* to book/ * Move changelogs to changes/* * Adapt the Makefile * Add a title to the javascript api index Related to #4832808

Data as objects
===============

In this chapter, we will introduce the objects that are used to handle
the logic associated to the data stored in the database.

.. toctree::
   :maxdepth: 1

   data-as-objects
   load-sort
   adapters
   application-logic