Add CSS clean tool.

[zanerock]

Relatively easy to integrate CSS check with website analysis. Use ghost or node test to walk the pages as a client, and observe the CSS which is used. Compare to list of CSS selections and create list of unused rules. (Since the devel console can tell us this, I assume we can pull the list of rules effecting each element.)

This is the kind of tool we could 'app'-ize. Sell for $5 / year or something. (Off topic: Sustainable programs need to be maintained. Over time, price should drop as ecosystem stabilizes, but maybe jumps. I like the idea of putting out a standard model that builds up some cash reserves, then starts to price at assumed expenses based on past, some padding, cash reserves, and possible excess cash. In the presence of excess cash, the price drops. In the presence of a reserves deficit, the price increases to cover. 18 months of operating expenses are held in reserves? Of course, all this is parameterizable, but something like that would be bullet proof without being too cumbersome.)

https://unused-css.com/pricing