This may be customised differently than the main page later on, but
for now the important thing is that this constantly refreshed page does not
allocate a new NotificationHandle each time it's loaded.
Very happy to have a reusable autoUpdate widget that can make any Yesod
widget automatically refresh!
Also added support for non-javascript browsers, falling back to meta
refresh.
Also, the home page is now rendered with the webapp status on it, before
any refreshing is done.