refactor: use npm workspaces to manage installation of packages

npm workspaces can install our workspace package dependencies far
quicker than athloi. This removes the need for the postinstall script.
This also finally introduces the much needed package-lock.json for the
repo.

Author: joelcarr

.gitignore

@@ -4,7 +4,6 @@ dist/
 .DS_Store
 Thumbs.db
 npm-debug.log
-package-lock.json
 yarn.lock
 .vscode
 .cache