Email Footer Update

[DanielJPino-ux]

Please update the email address link on the footer of the NASA design system page (https://nasa.github.io/nasawds-site/) to the new uswds email address: uswds@support.digitalgov.gov as we are cutting over to a new email.

[bruffridge]

OK, I updated the email link. I also posted a notice on that site that it will no longer be maintained going forward.