Use `/` as the default status endpoint

It seems strange to have the default status endpoint set as
`/status/check`, as most people do not implement this as an endpoint in
their web applications. The `/status/check` endpoint is more of an
internal convention than a community standard, so we should default this
to something more likely to be able to report an application's health.
In most cases, the root path should simply work for this out of the box.

Signed-off-by: David Celis <me@davidcel.is>
(spoke with David, putting logic here for posterity). As we use this extensively internally we need to have it be the scaffolded default. I think it still serves the purpose of a good example, and as your change makes `/` the default, there is not much risk that other people will see a detrimental effect of having `/status/check`.