Send herald daily summaries using a cron job, instead of sending them "after the first block with a timestamp on a new day"
This allows us to send messages at the same time every day.
We also send these cron job messages to a new channel. Having a channel dedicated to daily summaries is more user friendly than a channel of all the blocks, which is more for power users and devs.
Note: for now, we keep the "send daily summaries to main herald channel on first block of the new day" functionality. Want to make sure this works before taking that out.