[openstreetmap/openstreetmap-website] Dark Mode (#2332)

[pkrasicki]

Invert just by itself looks ugly, but you inspired me to play with other properties and I got this:

Before:
![openstreetmap-default](https://user-images.githubusercontent.com/49721209/99157209-e86c8580-26be-11eb-8deb-cef85dda2508.png)

After:
![openstreetmap-filters](https://user-images.githubusercontent.com/49721209/99157211-ec000c80-26be-11eb-8cf9-c982f27a7902.png)

Code:
`filter: brightness(0.6) invert(1) contrast(3) hue-rotate(200deg) saturate(0.3) brightness(0.7);`

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