Handle GA4 data

Updates the site to handle new GA4 reporting data.

Other changes/updates in this release include:

• Incorporates USWDS into the site and deprecates the bourbon and neat libraries.
• Replaces layout grid, colors, fonts, and components with USWDS standards
• Adds official US government website banner
• Removes deprecated reports for Internet Explorer versions
• Addresses many accessibility issues as shown by scans with Axe Devtools, ANDI, and Pa11y.
• Enforces static code analysis and unit tests in CI for all branches.
• Adds reminder to check logs for issues via CI
• Updates the node run time to v20.x which will be the long term support version of NodeJS until Q1 2026.
• Improve the repo README document to inform onboarding of new developers.