feat(www): add accessibility statement (#13190)
feat(www): add accessibility statement (#13190)

* add accessibility statement to homepage

* link and copy updates

* Update docs/accessibility-statement.md

Co-Authored-By: marcysutton <759d226c2d8164c0dea86ae7b1bba565a33a9204@marcysutton.com>

* add link to WCAG 2.0

Co-Authored-By: marcysutton <759d226c2d8164c0dea86ae7b1bba565a33a9204@marcysutton.com>

* remove homepage footer until it gets a review

* update "last updated" date

ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby