[web/application] remove `path` argument from CubicwebPublisher methods
Path can actually be accessed from `req` object. This allows to avoid duplicating
this information.
This cset prepares the next ones that aim at adding the language as a prefix of the
relative path.
../../doc/book usr/share/doc/cubicweb-documentation
../../doc/_build/html usr/share/doc/cubicweb-documentation