feat: remove THUMBNAIL_SIZES setting

steering/settings.py

@@ -132,10 +132,6 @@ INSTALLED_APPS = (
 
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 
-# Set the desired sizes for your thumbnails (px)
-# Will apply to all uploaded images
-THUMBNAIL_SIZES = ["640x480", "200x200", "150x150"]
-
 # When generating schedules/timeslots:
 # If last_date wasn't set manually, add timeslots until these number of days after the start_date
 AUTO_SET_LAST_DATE_TO_DAYS_IN_FUTURE = 365