[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

Web side development
====================

In this chapter, we will describe the core APIs for web development in
the *CubicWeb* framework.

.. toctree::
   :maxdepth: 2

   publisher
   controllers
   request
   searchbar
   views/index
   rtags
   ajax
   js
   css
   edition/index
   facets
   internationalization
   property
   httpcaching
   resource