Improve documentation for creating new styles with the styler .py (or release labels_only versions!)

[kmcd39]

I've used Carto basemaps for leaflet before. I'm trying to update my practices to use deck.gl and/or mapbox js gl.

I want to continue using carto basemaps as I change! With leaflet, there were both no-labels and labels-only variations of each of the carto styles! So i could sandwich my data between the two to make layers on top of the data, and give users an option to toggle the labels on/off.

I'm not experienced changing .json files, so it'd be helpful to have more ready-made layers, as were available for leaflet, including roads, labels-only, and no-labels (instead of only no-labels). Failing that, the documentation could be improved (Do i change the {style}_vars.json to make parts of the map I don't want to include "transparent"? Or do I delete them? Or an alternative?) Documentation on what vars are what could be helpful too -- for example what are the layers suffixed with _case? (i.e, "road_service_case", road_minor_case")

Thank you!