App view WIP: Show service unavailable notice when app 503s

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
Bump marbles-js

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
Bump flynn-dashboard-web-icons (add edit icon)

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
List apps

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>