layout.haml: specify a content-type, suggest UTF-8.
layout.haml: specify a content-type, suggest UTF-8.

Signed-off-by: Steven Black <efe92b1a55c3d64d903ecee9d602a2db10915477@stevenblack.com>

WardCunningham/Smallest-Federated-Wiki,rkh/Smallest-Federated-Wiki,WardCunningham/Smallest-Federated-Wiki,WardCunningham/Smallest-Federated-Wiki,rkh/Smallest-Federated-Wiki,WardCunningham/Smallest-Federated-Wiki