Update CI demo

doc/ci/index.md

@@ -32,10 +32,10 @@ For a complete overview of these methodologies and GitLab CI/CD,
 read the [Introduction to CI/CD with GitLab](introduction/index.md).
 
 <div class="video-fallback">
-  Video demonstration of GitLab CI/CD: <a href="https://www.youtube.com/watch?v=1iXFbchozdY">Demo: CI/CD with GitLab</a>.
+  Video demonstration of continuous integration with GitLab CI/CD: <a href="https://www.youtube.com/watch?v=ljth1Q5oJoo">Continuous Integration with GitLab (overview demo)</a>.
 </div>
 <figure class="video-container">
-  <iframe src="https://www.youtube.com/embed/1iXFbchozdY" frameborder="0" allowfullscreen="true"> </iframe>
+  <iframe src="https://www.youtube.com/embed/ljth1Q5oJoo" frameborder="0" allowfullscreen="true"> </iframe>
 </figure>
 
 ## GitLab CI/CD concepts