Match the beatmap page `hue` to the chosen `difficulty` color

[cyperdark]

it'll be a nice addition if beatmap page hue was changing to match selected difficulty color hue. It would look like this in different hue's

[peppy]

Might be interesting to try out, but not sure. We generally have colour hues dedicated to sections of the site right now, which is intended to help users figure where they are with an extra visual cue.