Add lush shadow from https://www.joshwcomeau.com/shadow-palette/

[Profesor08]

closes #1

Add lush shadow from https://www.joshwcomeau.com/shadow-palette/

Allows to create cool shadows same as in example link

Examples

.low {
  box-shadow: --lush-shadow(
    low -0.25 -0.5 0.5 0.5 0.75 oklch(0 0 0 / 15%)
  );
}

.medium {
  box-shadow: --lush-shadow(
    medium -0.25 -0.5 0.5 0.5 0.75 oklch(0 0 0 / 15%)
  );
}

.high {
  box-shadow: --lush-shadow(
    high -0.25 -0.5 0.5 0.5 0.75 oklch(0 0 0 / 15%)
  );
}

.inset {
  box-shadow: --lush-shadow(
    medium inset -0.25 -0.5 0.5 0.5 0.75 oklch(0 0 0 / 15%)
  );
}