[hooks] Drop "logstats" hook
It is now useless as its looping task would not run on a web instance because
respective repository has no scheduler.
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