[RFC] Rename `measure`?

[madeleineostoja]

Measure might be the correct typographic name for the width of a block of text, but it's pretty unintuitive for developers, where measure has so many other meanings (like, measuring something).

Tailwind has a single value for this, called max-w-prose, which isn't exactly elegant. Maybe --prose- or --text-width-

[madeleineostoja]

Renamed to prose- and extended the scale in 6855824