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/resources/generated/sidebar.mjs

@@ -8732,6 +8732,14 @@ export const generatedSidebar = [
         "title": "Medusa Container Resources",
         "children": []
       },
+      {
+        "loaded": true,
+        "isPathHref": true,
+        "type": "link",
+        "path": "/events-reference",
+        "title": "Events List",
+        "children": []
+      },
       {
         "loaded": true,
         "isPathHref": true,