fix(web): filter out outdated schedules

[joe50261]

The schedule is now filled with outdated schedules that take up pages. I refer to the existing startAt parameter and try to modify the initial value when the page loads. But I never actually ran the code or debugged it, so please evaluate with caution.

[PoiScript]

Thanks for contributing! I replaced startAt === 0 ? Date.now() : startAt with max([startAt || 0, subHours(Date.now(), 6)]) to only filter out streams that scheduled at 6 hours ago, since they are sometimes late starting streams.

[PoiScript]

And it's deployed now. ;)