Mimic theme from Tailwind config

[dcastil]

Closes #54

[dcastil]

Until here I only added the color and spacing scales. It adds ca. 0.11 kB to the Brotli-compressed bundle and 0.09 kB to the GZipped bundle.

[dcastil]

Here I added all the keys from the Tailwind config. The Brotil-compressed bundle increased by 1.07 kB and the GZipped bundle increase by 1.19 kB relative to the current main branch.

[dcastil]

Here I removed all the theme keys which are only used in a single classGroup. This reduces the bundle size a little.

State	GZip size	Brotli size
Main branch	4.62 kB	4.09 kB
Support for colors and spacing	4.71 kB	4.2 kB
Support for all theme keys	5.81 kB	5.16 kB
Support for all theme keys which affect multiple classGroups	4.94 kB	4.39 kB