feat: add raw value for use in css and update css palette

[RoootTheFox]

I noticed that some colors in the css color palette are outdated (example: latte rosewater is #dc8a78 according to the README on the main repo but is #de9584 in the current CSS.

I also added a raw value in the CSS which makes it easier to eg. modify the opacity of the color like so:

element {
   color: rgba(var(--ctp-mocha-teal-raw), 0.5);
}

This does not work with hex, rgb or hsl colors but defining them as a custom value like the raw value I added makes this possible.

[nekowinston]

Thanks!