Proper submodule commands need to be added for setup

[RyPeck]

The Setup development environment and deployment instructions don't include instructions for initializing and updating the submodules (kibana).

I believe all that needs to be run is -

git submodule update --init --recursive

Or you could instruct users to clone the repo using the command -

git clone --recursive

[rammie]

Done. The README.md has been updated.