Improve adherence to GSA branding guidelines

[RachelF]

Consistently apply branding according to GSA Design Guidelines and 21cIDEA requirements.

• [ ] Implement USWDS banner component
• [ ] Implement USWDS identifier component
• [ ] Implement USWDS footer component

Story

As a GSA customer I want to see clear signposts that I'm on an official GSA website So that I can be assured that I'm on the right site and interacting with the official GSA organization

Acceptance Criteria

Given GSA branding guidelines and USWDS components are applied consistently across all our websites When users visit any GSA website Then they recognize and can trust that they are on an official GSA/government site