[7.17] [DOCS] Add redirect for alerts and actions (#144251) (#148338)

# Backport

This will backport the following commits from `main` to `7.17`:
- [[DOCS] Add redirect for alerts and actions
(#144251)](#144251)

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

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

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docs/redirects.asciidoc

@@ -387,3 +387,8 @@ This content has moved. Refer to <<xpack-profiler>>.
 == Rendering pre-captured profiler JSON
 
 This content has moved. Refer to <<xpack-profiler>>.
+
+[role="exclude",id="managing-alerts-and-actions"]
+== Alerts and Actions
+
+This page has been deleted. Refer to <<alerting-getting-started>>.