Ashley POC - Make typography size adjustments

[taysea]

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What does this PR do?

This is a draft PR for Ashley so she can assess some typography sizing explorations she's working on in a wider set of examples from the site. She is exploring reducing the base text size from 18px/24px line-height to 16px/20px line height.

Where should the reviewer start?

What testing has been done on this PR?

In addition to the feature you are implementing, have you checked the following:

General UX Checks

• Small, medium, and large screen sizes
• Cross-browsers (FireFox, Chrome, and Safari)
• Light & dark modes
• All hyperlinks route properly

Accessibility Checks

• Keyboard interactions
• Screen reader experience
• Run WAVE accessibility plugin (Chrome)

Code Quality Checks

• Console is free of warnings and errors
• Passes E2E commit checks
• Visual snapshots are reasonable

How should this be manually tested?

Any background context you want to provide?

What are the relevant issues?

Screenshots (if appropriate)

Should this PR be mentioned in Design System updates?

Is this change backwards compatible or is it a breaking change?