Explore Figma plugin GUI and functionality with Github sync

[Thunear]

Explore how the Figma Plugin might look and work with our current Token structure and the ability to fetch changes from a Github repo.

Experimental features testing:

• [x] Move color generation into plugin
• [x] Sync themes from figma into the plugin on startup and show them
• [x] Add create, update and delete themes from the plugin
• [x] Update colors for for different themes with the plugin
• [ ] Create CSS and push to a repo
• [ ] Explore system to keep tokens in sync with external source of truth