Remove link to outdated demo video

doc/user/application_security/secret_detection/index.md

@@ -328,14 +328,6 @@ as part of your normal job definition.
 A new configuration variable ([`SECRET_DETECTION_HISTORIC_SCAN`](#available-cicd-variables))
 can be set to change the behavior of the GitLab Secret Detection scan to run on the entire Git history of a repository.
 
-We have created a [short video walkthrough](https://youtu.be/wDtc_K00Y0A) showcasing how you can perform a full history secret detection scan.
-<div class="video-fallback">
-  See the video: <a href="https://www.youtube.com/watch?v=wDtc_K00Y0A">Walkthrough of historical secret detection scan</a>.
-</div>
-<figure class="video-container">
-  <iframe src="https://www.youtube.com/embed/wDtc_K00Y0A" frameborder="0" allowfullscreen="true"> </iframe>
-</figure>
-
 ## Running Secret Detection in an offline environment
 
 For self-managed GitLab instances in an environment with limited, restricted, or intermittent access