this option will currently not work => the cookie will never
be set by the server, if you use a different path other than "/"
in order for this to work we would need to introduce some kind of
"custom route prefix", that would make express serve the routes with
the custom prefix — but that kinda falls more into a reverse proxy
job territory.
So let's remove this feature for now and amend the docs on how to
correctly handle the cookies per instance via the reverse proxy.
