Placeholder content could be improved

[mattstein]

Description

The Accessibility page describes a commitment to accessibility and user experience that is not maintained in spirit by the identical pages of placeholder content, which ideally would:

• visually distinguish one page from another at a glance
• show off the flexible content model and design work that’s already there
• help someone orient themselves especially if they’re navigating through filler copy with a screen reader
• entertain?

Obviously it can’t all be real content for a fake site, but we should probably audit and improve what we can for maximum demo potential.