WIP-2211: Layouts

[mariohernandez]

Adds the following Layouts components. NOTE: Not all items here have or need a Storybook story. Some of them are simply css styles without markup or data.

• Block
• Event
• Facet-block
• Layout
• Layout-view-grid-horzontal
• Layout-view-grid-vertical
• Page
• Page-listing
• Region
• Site-container
• View
• View-event
• View-grid
• View-listing