Design a branded Homepage Hero component

[andycochran]

Summary

Apply the approved brand to the Homepage Hero component.

Note: This is a custom component that uses .usa-dark-background which is not well-documented. You must be cautious/explicit about how colors and typography appear nested within this class.

Acceptance criteria

• Senongo has approved the brand application
• Emily has approved the design
• FE ticket has been updated per Plan frontend work for implementing branded USWDS #2632