Add a short introduction to the index page

docs/sources/v0.50.x/set-up/set-up-distributed-k6/_index.md

@@ -5,6 +5,15 @@ title: Set up distributed k6
 
 # Set up distributed k6
 
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+It's possible to run large load tests even when using a single node, or single machine. But, depending on your use case, you might also want to run a distributed Grafana k6 test in your own infrastructure.
+
+A couple of reasons why you might want to do this:
+
+- You run your application in Kubernetes and would like k6 to be executed in the same fashion as all your other infrastructure components.
+- You want to run your tests within your private network for security and/or privacy reasons.
+
+[k6 operator](https://github.com/grafana/k6-operator) is a Kubernetes operator that you can use to run distributed k6 tests in your cluster.
+
+This section includes the following topics:
 
 {{< section depth=2 >}}

docs/sources/v0.50.x/set-up/set-up-distributed-k6/usage/_index.md

@@ -5,6 +5,6 @@ title: Usage
 
 # Usage
 
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+This section includes the following topics:
 
 {{< section depth=2 >}}