Update store documentation

**Feature request**
It would be great to have notifications for handlers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_notifications` with default `false`.

Start by locating the handler configuration and notification flow in the repository. Review how existing options are defined, then trace where handlers run so the proposed enable_notifications setting can be applied. Done means the option defaults to false and notifications work when it is enabled, with relevant behavior verified.

Written by the indexing model from the issue text.