Accessibility: focus ring disappears on headings

[kburk1997]

Describe the bug
To reproduce:

1. Go to Redocly demo
2. Tab through page
3. Observe where focus ring is
   Expected behavior
   Focus is visible on all elements.

Actual behavior: focus is not visible on headings.

Screenshots
Screen recording with KeyCastr:

Screen.Recording.2023-09-07.at.1.35.06.PM.mov