Move lua_and_packages from userguide to sphinx.

doc/sphinx/_static/headers.js

doc/sphinx/_static/sphinx_design.css

doc/sphinx/_templates/layout.html

doc/sphinx/index.rst

doc/sphinx/reference/box_session.rst

doc/sphinx/reference/console.rst

doc/sphinx/reference/digest.rst

doc/sphinx/reference/expirationd.rst

doc/sphinx/reference/fiber-ipc.rst

doc/sphinx/reference/fiber.rst

doc/sphinx/reference/fio.rst

doc/sphinx/reference/index.rst

doc/sphinx/reference/json.rst

doc/sphinx/reference/log.rst

doc/sphinx/reference/msgpack.rst

doc/sphinx/reference/other.rst

doc/sphinx/reference/pickle.rst

doc/sphinx/reference/socket.rst

doc/sphinx/reference/tap.rst

doc/sphinx/reference/uuid.rst