Enhance event registration system:

- Update Google Sheets integration to support optional tab names.
- Add functionality to fetch and display public participants.
- Revise event configuration in YAML for clarity and consistency.
- Improve form layout with additional fields for contact information and meal preferences.
- Create a new home page template for event selection.
- Update success page to link back to the participants list.

docker-compose.yaml

@@ -4,6 +4,8 @@ services:
     build: .
     container_name: sailing_forms
     restart: unless-stopped
+    ports:
+      - "5000:5000"  
     volumes:
       # Mount the config file so you can edit it without rebuilding
       - ./events.yaml:/app/events.yaml