docs: Reduce cron job egress cost
Currently we pull the doc every 10min, that makes gst-docs artifact an imporant contributor to our egress. This is more of a task, but whoever got rights (@thiblahute ?) can you maybe double or tripple or make this daily ? We have uses 180GB in the month only for this. While the updates to the docs don't really match how often we change the API or the doc itself.