[8.18] Add a docs page about Detection-as-code rules management (#6656)

* First draft

* Moved locations

* Update docs/detections/detection-engine-intro.asciidoc

* Update docs/detections/detection-engine-intro.asciidoc

Co-authored-by: Nastasha Solomon <79124755+nastasha-solomon@users.noreply.github.com>

---------

Co-authored-by: Kseniia Ignatovych <40713348+approksiu@users.noreply.github.com>

Author: nastasha-solomon

docs/detections/detection-engine-intro.asciidoc

@@ -116,4 +116,14 @@ setting is not enabled in the `elasticsearch.yml` file. For more information, re
 [[detections-logsdb-index-mode]]
 == Using logsdb index mode 
 
-To learn how your rules and alerts are affected by using the {ref}/logs-data-stream.html[logsdb index mode], refer to <<detections-logsdb-index-mode-impact>>. 
+To learn how your rules and alerts are affected by using the {ref}/logs-data-stream.html[logsdb index mode], refer to <<detections-logsdb-index-mode-impact>>. 
+
+[discrete]
+[[manage-rule-dac]]
+=== Manage rules as code
+
+Utilize the https://dac-reference.readthedocs.io/en/latest/dac_concept_and_workflows.html[Detection-as-Code] (DaC) principles to externally manage your detection rules. 
+
+The {elastic-sec} Labs team uses the https://github.com/elastic/detection-rules[detection-rules] repo to develop, test, and release {elastic-sec}'s <<prebuilt-rules, prebuilt rules>>. The repo provides DaC features and allows you to customize settings to simplify the setup for managing user rules with the DaCe pipeline.
+
+To get started, refer to the https://github.com/elastic/detection-rules/blob/main/README.md#detections-as-code-dac[DaC documentation].