saturate($color, $amount)
Makes a color more saturated. Takes a color and a number between 0% and 100%, and returns a color with the saturation increased by that amount.
Examples: saturate(hsl(120, 30%, 90%), 20%) => hsl(120, 50%, 90%)
saturate(#855, 20%) => #9e3f3f Parameters: $color (Color) $amount (Number) — The amount to increase the saturation by, between 0% and 100% Returns: (Color) Raises: (ArgumentError) — if $amount is out of bounds, or either parameter is th