Add logs monitoring video (#1805)

Author: pavangudiwada

docs/playbook-reference/logs-triggers/index.rst

@@ -15,7 +15,11 @@ To achieve this, we’ll use:
 
     .. image:: /images/logs-to-metrics.png
 
-Let's get started!
+Let's get started! Here's a video explainer of how it works:
+
+.. raw:: html
+  
+  <div style="position: relative; height: 0; padding-bottom: 56.25%;"> <iframe src="https://www.youtube.com/embed/14Z4hVhlkWE" frameborder="0" allowfullscreen style="position: absolute; top: 0; left: 0; width: 100%; height: 100%;"></iframe></div>
 
 **Step 1: Create a namespace for the demo**
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