Adding in form role to checklist, skip nav link

Adding in a skip nav link, the form role to the site checklist
adding in little disclaimer about the form role
Merge branch 'gh-pages' of github.com:heitzke/a11yproject.com into heitzke-gh-pages

* 'gh-pages' of github.com:heitzke/a11yproject.com:
  adding in little disclaimer about the form role
  Adding in form role to checklist, skip nav link