Improve the README and bootstrap documentation

README.md

ansible/playbooks/bootstrap.yaml

bootstrap/calico/cni-config.yaml

bootstrap/calico/kustomization.yaml

bootstrap/calico/namespace.yaml

bootstrap/calico/node-config.yaml

bootstrap/networking/calico.yaml

bootstrap/networking/coredns.yaml

bootstrap/networking/kube-proxy.yaml

bootstrap/networking/kustomization.yaml

bootstrap/networking/namespace.yaml

bootstrap/networking/resources.yaml