Content that explains the User Bar & Accessibility Checker

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Wagtail 4.2 introduced a new amazing feature, an accessibility checker built in to the Wagtail user bar.

Someone recently asked on Slack about how this feature worked and I searched on the Guide but saw that it is not yet documented there.

I think it would be great to see the user bar generally documented and a call out to the accessibility checker and how to use it.

• https://docs.wagtail.org/en/latest/releases/4.2.html#accessibility-checker-integration
• https://docs.wagtail.org/en/latest/topics/writing_templates.html#wagtailuserbar-tag
• Maybe a new 'Concept' of Page Preview could work https://guide.wagtail.org/en-latest/concepts/ OR a new page under How-to 'view a Preview' - https://guide.wagtail.org/en-latest/how-to-guides/