Fix build

[jamesscottbrown]

This is a WIP - there are a few other changes that need to be made.

[jamesscottbrown]

This PR switches to defining workspaces in the top-level package.json file, causing packages to be installed in a top-level node_modules directory, which breaks some things.

The simplest quick fix is probably to have a script that runs npm_install to separately install dependencies into the node_modules directory for each project, and npm link to create symlinks for dependencies that correspond to other packages in the same repo.