[WIP] Refactor docs

Fix #94.
are you talking about removing the whole default.rst? i think dumping the default configuration is something that the user can do for himself, it has no big value here. the reference sections on each part are what has added value.

the rest of this file should probably be in the general introduction if we don't give an overview of the functionalities of this bundle already.

so yes, i think we can drop default.rst if this is what you are proposing ;-)