Add ANSI Colours into CSS output

In the [style guide](https://github.com/catppuccin/catppuccin/blob/main/docs/style-guide.md) bold colors are mentioned but they're not available in the css palette. Could they be added like --ctp-mocha-ansi-red for
 ![mocha red](https://github.com/catppuccin/catppuccin/blob/main/assets/palette/circles/mocha-ansi-red.png?raw=true)