Update to colour JS on piperhaywood.com

Just pushed an update to the colour JS on piperhaywood.com. The HSL colour has been looking pretty muddy recently, partly since it’s an orange-y hue this time of year, but mostly because sunrise and sunset weren’t being taken in to account properly. Before, the lightness value changed gradually between 12:01am and midnight. Now it looks a little more “sunny” in the daytime. Will need to keep monitoring the min/max values, yellow could be problematic.