Can't browse the site using a different date

[elydpg]

If I'm using the API, then I can change the date to see what the message is for different days. However, this doesn't work for the site: https://shouldideploy.today/api?date=2023-11-08 correctly tells me I can deploy, but https://shouldideploy.today/?date=2023-11-08 still tells me not to deploy because of Christmas

[baires]

The web interface doesn't handle the date parameter from the URL query string like the API does. I need to think about this a little more PR's are welcome