Accessibility Page Score statements

[mgifford]

I like the idea of the Accessibility Page Score but am a bit worried about the like "This score can measure compliance for static content" - axe only catches about 1/3rd of the errors. So ultimately even if there were no identified errors the page could still be very inaccessible.

Would be good to update this https://github.com/adhocteam/a11y-snippets/blob/master/worksheets/README.md