docs: document events reference (#9080)

- Remove old hidden reference files that document modules' events
- Add new events reference for workflow events
- Reference events reference in the main docs

www/apps/book/app/basics/events-and-subscribers/page.mdx

@@ -115,3 +115,9 @@ export const config: SubscriberConfig = {
 ```
 
 You use the container to resolve the Product Module's main service, then log the title of the created product.
+
+---
+
+## Events List
+
+Find a list of all emitted events in [this reference](!resources!/events-reference).