Consolidated variables in the .env.example and added the worker to a customizable list

.env.example

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+export KUBE_USER="ubuntu"
+export PRIVATE_KEY_PATH="$HOME/.ssh/id_ed25519"
+export KUBE_CP="k8s-control-plane"
+## Add workers to this list!
+export KUBE_WORKERS=("k8s-worker1")
+export ANSIBLE_DIR="ansible"
+export POD_NET_CIDR="192.168.0.0/16"
+export CNI_VER="v3.30.2"
+export API_ADDR=$(getent hosts "$KUBE_CP" | awk '{ print $1 }')
+export ACME_MAIL="name@mail.example"
+export IP_POOL_RANGE="192.168.1.10-192.168.1.20"
+export LOAD_BALANCER_IP="192.168.1.10"
+export LONGHORN_DNS_NAME="longhorn.domain.tld"