[REQUEST] Create GitHub Actions to help toolchain to transform design tokens

## Suggestion/Concern

Related to, and depends on, #770. Once a Theme Builder instance is associated with a GitHub repo and pushes a new design system or a design system update to GitHub, we probably need GitHub Actions defined that will run when the target folder has changes and will transform the generated design token JSON and turn it into CSS.

Resources given to me by @lwnoble:

https://github.com/tokens-studio/sd-transforms
https://configurator.tokens.studio/

## Proposed Solution

The idea here is that when a design system is updated by Theme Builder, we should be able to pass the artifacts to the designers for use in Figma (design tokens) and to the developers for use in applications (CSS)