[Bug]: Homepage has accessibility issues in both light/dark mode for all devices

[StephNathai]

Summary

To Reproduce Steps to reproduce the behavior:

1. Go to home page
2. Run accessibility check (I used AxeDevTools - see screenshots below of issue)
3. Repeat for dark mode

Expected behavior: Expect no accessibility issues

Page

https://react.dev/

Details

Mobile: Light Mode

Mobile: Dark Mode

Desktop: Light Mode

Desktop: Dark Mode

[StephNathai]

I will fix this issue with a PR shortly.