Docs: update and polish "Kubernetes on AWS" example

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

examples/kubernetes-aws/main.cue

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"dagger.io/aws"
+	"dagger.io/aws/eks"
+)
+
+// AWS account: credentials and region
+awsConfig: aws.#Config & {
+	region: *"us-east-2" | string
+}
+
+// Auto-provision an EKS cluster:
+// - VPC, Nat Gateways, Subnets, Security Group
+// - EKS Cluster
+// - Instance Node Group: auto-scaling-group, ec2 instances, etc...
+// base config can be changed (number of EC2 instances, types, etc...)
+infra: #Infrastructure & {
+	"awsConfig": awsConfig
+	namePrefix:  "dagger-example-"
+	workerNodeCapacity:     int | *1
+	workerNodeInstanceType: "t3.small"
+}
+
+// Client configuration for kubectl
+kubeconfig: eks.#KubeConfig & {
+	config:      awsConfig
+	clusterName: infra.clusterName
+}