start working on always_show task

README.md

@@ -11,11 +11,8 @@
 - [] after an hour(?) of inactivity -> show large popup w/ "maybe old data (ignore) (reload page)" (ignore bc maybe use is actively doing something -> don't throw input away!)
 
 ## Backend
-- [] Do deletion of trip automatically (amount_user = 0) is someone is already registered; simplify FAQ!
-- [] Allow sign-outs only >2h before event
 - [] add `always_show` to `planned_trips` (e.g. for wanderfahrten)
 - [] `planned_events` -> ICS feed to be [integrated](https://icscalendar.com/shortcode-overview/) in homepage calendar
-- [] Notification system (-> signal msgs?) e.g. if new event; somebody unregistered
 
 # Nice to have
 ## Frontend