Add support for other directories

[justindra]

Currently this only matches with any packages under the packages/ directory. Some monorepo setups may change this folder to be something else. Maybe we can read a lerna.json file or the root package.json file to get the list of folders and then match on those as well?

[MeirionHughes]

Defiantly; we're setup with "apps/", "libs/" and "servers/" as package roots