no issue
Our server-defined `mobiledoc` object was required by `UrlUtils.cardTransformers` property to help set up a shortcut for url transform functions but that was breaking the independence of `UrlUtils` by crossing the shared/server boundary.
- `cardTransformers` is only needed for the `mobiledocToTransformReady` utility function that will only be used by the server
- removed `UrlUtils.cardTransformers` (and associated require) from our `UrlUtils` instance and updated the few areas the server uses `mobiledocToTransformReady()` to pass in the mobiledoc card objects directly as an option
