refactor(sort-orders): remove outdated deployment and implementation guides

- Deleted the `DEPLOYMENT_GUIDE_SORT_ORDERS.md` and `SEPARATE_SORT_ORDERS_IMPLEMENTATION.md` files as they are no longer relevant following the recent updates to the sort orders feature.
- Introduced new migration scripts to address duplicate sort orders and ensure data integrity across the updated task sorting system.
- Updated database schema to include new sort order columns and constraints for improved performance and organization.
- Enhanced backend functions and frontend components to support the new sorting logic and maintain user experience during task organization.

worklenz-frontend/src/components/task-list-v2/TaskRow.tsx

@@ -113,7 +113,7 @@ const TaskRow: React.FC<TaskRowProps> = memo(({
   const style = useMemo(() => ({
     transform: CSS.Transform.toString(transform),
     transition,
-    opacity: isDragging ? 0.5 : 1,
+    opacity: isDragging ? 0 : 1, // Completely hide the original task while dragging
   }), [transform, transition, isDragging]);
 
   return (