Explore support for named scopes

[AndrewIngram]

Similar to how Tailwind supports group/{name} for their group classes, it'd be interesting to explore something similar here.

Possible API:

<div class="hue/primary-teal hue/secondary-slate">
   <article class="bg-hue/secondary-800 p-4">
     <h2 class="text-hue/primary-200">Some heading</h2>
     <!-- and so on -->
  </article
</div>