This change, which was originally introduced in #9136, resulted in much
larger installs for Kibana (50MB larger in dev mode), which isn't a
reasonable tradeoff for the convenience that global-style provides.
Installing dependencies "global-style" creates a top-level directory in `node_modules` for each direct dependency, and then creates a flat tree of dependencies inside each of those.
I prefer this method because it prevents accidentally depending on a dependency of a dependency, and makes it easier to find dependencies in `node_modules`.
Unfortunately the `node_modules` directory will be a little deeper.
