Update core documentation

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

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

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

The issue names hook handling and the configuration option `enable_notifications`, but no files or tests. Start by locating the hook entry point and config parsing, then determine how a disabled-by-default option should affect hook notifications and how to verify the behavior.

Written by the indexing model from the issue text.