drop tordate

on top of !531 (merged), this removes tordate 🎉

closes #15548 (closed)

closes #18502 (closed), #18460 (closed) , #6112 (closed) , #18449 (closed), #9256 (closed), #16471 (closed), #11589 (closed) , #5394 (closed)

• drop tordate
• update design doc
• move 20-time.sh logic to systemd unit files → moved to #18517
• "Fix Time" button
• clean logging messages in tca-portal