Add container_image example to create-react-app example

[w4-hanggi]

container_image(
    name = "nginx_image",
    base = "@io_docker_index_nginx//image",
    directory = "/etc/nginx",
    files = [
        "nginx.conf",
    ],
)

container_image(
    name = "image",
    base = ":nginx_image",
    data_path = "./build",
    directory = "/www",
    files = [
        ":build",
    ],
    visibility = ["//visibility:public"],
)

This is not works based on create-react-app example.