add czechitas as community sponsor

Author: EtssMM

data/events/2025/prague/main.yml

@@ -90,6 +90,8 @@ sponsors:
     level: community
   - id: art4people
     level: community
+  - id: czechitas
+    level: community
 
 sponsors_accepted : "yes" # Whether you want "Become a XXX Sponsor!" link