message: Add link to styling doc at Summary.md
diff: ## Content
  * Guides
  - + [Roadmap](./docs/roadmap.md)
  + + [Styling](./docs/styling.md)
  + [Architecture](./docs/architecture.md)
  + + [Roadmap](./docs/roadmap.md)
  + [Contributing](./contributing.md)
  + [Code of Conduct](./CODE_OF_CONDUCT.md)
  * Examples
  