[Docs] Identify opportunities for education and training for layout components about foundational-design-system-proto

[sarahill]

Couple ideas from Chloe:

Create a series of short videos that:

• Show the difference between Polaris layout components and foundational components (ex. comparison of the stack components)
• Introduces the new way working using foundational components

[sarahill]

We’ve written and shipped documentation in shopify/polaris repository readme files for the foundational layout components. We focused on publishing content for the component api and current design tokens to bring visibility to the current capabilities within the foundation.

We also started constructing a demo along with a layout quick start guide. We’ll pause the quick start guide for now. We believe we’ve got the right information surfaced for us to learn and reference as we move on to working with the Deliver and Operate teams in the coming cycles.