* Add icon for UnoCSS
* Replace `main` with commit SHA for icon source
Co-authored-by: Sigurd Spieckermann <2206639+sisp@users.noreply.github.com>
* Use `#333333` as the hex
* Increase precision from 3 to 4
Co-authored-by: Sigurd Spieckermann <2206639+sisp@users.noreply.github.com>