Review and consider new pre-made transforms

[d01000100]

StyleDictionary 3.0 introduced more pre-made transforms.

The transform size/pxToRem is particularly interesting, because it does something similar to our custom transform transformToRem. It would be better for the maintenance of this project to use the pre-made one.

It also receives how many px's 1 rem converts to in the StyleDictionary options:

// config.json
{
    ...
    "platforms": {
        "scss": {
            ...
            "basePxFontSize": 16  // optional, defaults to 16
        }
    }
}