Explanation of the Cocoon directory structure

[Dev at weitling]

Hi!

The Cocoon directory structure isn't very concise: many directories with 
the same or at least similar names at different locations, some 
directories with non-intuitive names (e.g. lib/endorsed: why endorsed?).

If there's a problem I don't know where to look, I don't know where to 
place my files, I don't know which parts are superfluous and and and...

Are docs about that anywhere in the outside world without having to pay 
> $ 30 for an outdated book?

Bye,
Florian