Set remaining training events to "booked out"

_events/2020-11-04-erste-schritte-in-python.md

@@ -14,7 +14,7 @@ end:
 registration_link: https://hifis-events.hzdr.de/event/29/
 location:
     campus: "Online Event"
-fully_booked_out: false
+fully_booked_out: true
 registration_period:
     from:   "2020-10-26"
     to:     "2020-11-03"

_events/2020-12-15-GitLab-Software-Development-Teams-2020-12-15-sd4teams.md

@@ -15,7 +15,7 @@ end:
 location:
     campus: "ONLINE"
     room:   ""
-fully_booked_out: false
+fully_booked_out: true
 registration_link: https://hifis-events.hzdr.de/event/28/
 registration_period:
     from:   "2020-10-05"