[7.13] [DOCS] Add redirect for alerts and actions (elastic#144251) (elastic#148342)

# Backport

This will backport the following commits from `main` to `7.13`:
- [[DOCS] Add redirect for alerts and actions
(elastic#144251)](elastic#144251)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Add redirect for alerts and actions
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BACKPORT-->

Author: lcawl

docs/redirects.asciidoc

@@ -345,3 +345,7 @@ This content has moved. Refer to <<discover-view-surrounding-documents>>.
 
 This content has moved. Refer to <<string-field-formatters>>.
 
+[role="exclude",id="managing-alerts-and-actions"]
+== Alerts and Actions
+
+This page has been deleted. Refer to <<alerting-getting-started>>.