Put permanent modal on landing page explaning current status + link to nextrequest.com #73

@andyhull I would do this but my local dev environment for the postcode site seems to be a bit funky. It would probably be easier/faster for you to do it than help me fix my dev environment.

Suggested text (centered in a modal):

The PostCode team is now working on NextRequest full time. We're helping rethink and improve the public records request process and would love your support.

Learn more at www.NextRequest.com