Theme-ui: Implement Theme UI to Bootstrap utility class transformer

[johno]

Since Bootstrap uses utility classes we can build a transformer to generate static CSS from a Theme UI config.

[holloway]

@johno on the static css page it says Bootstrap is still TODO.

If I wanted to add support for this, where should I start? What code should I base this on?

[jxnblk]

There are currently two packages that do something similar: @theme-ui/tachyons and @theme-ui/tailwind

[lachlanjc]

We’d still love for this to happen, but due to the lack of activity we’re closing for now.