Update docs

Author: deliahu

docs/operator/install.md

@@ -42,6 +42,8 @@ Cortex runs on Kubernetes. If you don't already have a Kubernetes cluster, [eksc
 eksctl create cluster --name=cortex --nodes=2 --node-type=t3.medium
 ```
 
+This cluster configuration will cost about $0.29 per hour.
+
 ## Operator
 
 The Cortex operator is a service that runs on Kubernetes, translates declarative configuration into workloads, and orchestrates those workloads on the cluster. Its installation is configurable. For a full list of configuration options please refer to the [operator config](config.md) documentation.

docs/quick-start.md

@@ -15,6 +15,7 @@ You can download pre-built applications from our repository:
 ```bash
 git clone -b master https://github.com/cortexlabs/cortex.git
 cd cortex/examples/iris
+cortex deploy
 ```
 
 Jump to [deploy the application](#deploy-the-application).