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/app/commerce-modules/region/_events/_events-table/page.mdx

@@ -1,57 +0,0 @@
-import { Table } from "docs-ui"
-
-<Table>
-  <Table.Header>
-    <Table.Row>
-      <Table.HeaderCell>Event Name</Table.HeaderCell>
-      <Table.HeaderCell>Description</Table.HeaderCell>
-      <Table.HeaderCell>Data Payload</Table.HeaderCell>
-    </Table.Row>
-  </Table.Header>
-  <Table.Body>
-    <Table.Row>
-      <Table.Cell>
-
-      `region.deleted`
-
-      </Table.Cell>
-      <Table.Cell>
-
-      Triggered when a region is deleted.
-
-      </Table.Cell>
-      <Table.Cell>
-
-      ```ts blockStyle="inline"
-      {
-        // the ID of the deleted region
-        id,
-      }
-      ```
-
-      </Table.Cell>
-    </Table.Row>
-    <Table.Row>
-      <Table.Cell>
-
-      `country.deleted`
-
-      </Table.Cell>
-      <Table.Cell>
-
-      Triggered when a country is deleted.
-
-      </Table.Cell>
-      <Table.Cell>
-
-      ```ts blockStyle="inline"
-      {
-        // the ID of the deleted country
-        id,
-      }
-      ```
-
-      </Table.Cell>
-    </Table.Row>
-  </Table.Body>
-</Table>

www/apps/resources/app/commerce-modules/region/_events/page.mdx

@@ -1,17 +0,0 @@
-import EventsTable from "./_events-table/page.mdx"
-
-export const metadata = {
-  title: `Region Module Events Reference`,
-}
-
-# {metadata.title}
-
-Find in this reference the list of events emitted by the Region Module.
-
-<Note type="soon">
-
-Events are still in development, so this reference will change in the future.
-
-</Note>
-
-<EventsTable />