Opinionated: dim background color of swagger a tiny bit to comfort eyes

[uvulpos]

In UI/UX there is a philosophie, that you never work totally bright nor dark colors. They dimm the color always a bit. I would suggest to do the same with our default swagger. We can make it configureable, but I would recommand to make it default. I'll add two screenshots from my local swagger (ignore the changed logo and accent color) and one with my dark reader browser plugin enabled:

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