Function scale

Produces a stepped scale of colours.

Builds off createSteps which can only step between two colours.

// A scale of from red to green, with three colours in-between
const steps = Colour.scale([ `red`, `green` ], { stepsBetween: 3 });
for (const step of steps) {
 // A CSS colour string
}
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cssLinearGradient can produce a smooth gradient in CSS on the basis of the stepped colours.