Properly attribute client-side dependencies

[cdchapman]

• Create Command to pull in descriptions of client-side dependencies (use npm view [package_name] --json)
• Create DataSource pulling info from package.json
• Update colophon to list the client-side dependencies

[cdchapman]

Some reasons to migrate from bower: https://gofore.com/en/stop-using-bower-and-how-to-do-it/

[cdchapman]

How do we differentiate between ruby gem dependencies and npm dependencies?