Accessibility checker in Page Editor (6.0)

[lb-]

A new feature is coming in 6.0 and it would be good to highlight this in the New in Wagtail section.

This in page editor accessibility checker is a critical part of the accessibility roadmap.

See

• https://docs.wagtail.org/en/latest/advanced_topics/accessibility_considerations.html#authoring-accessible-content
• https://github.com/wagtail/wagtail/pull/11478
• https://github.com/wagtail/wagtail/issues/10136