CSS4, CSS5, etc - logo variants

this is the new place to discuss and create variants of the new CSS logo that showcase a specific version. once we find the ones we love, we'll promote them into a folder in this repo and make them easy to use ❤️

would be epic if 4 or 5 would use one of it’s colors defined using oklab and beyond sRGB, such as in P3 🤓

could even do one of those newly enabled nicer gradients, but that’s perhaps too much for the logo…