Update main readme mission statement to mention Compose applications, remove Beta warning, add ACI example on CI deployments
Update main readme mission statement to mention Compose applications, remove Beta warning, add ACI example on CI deployments

Signed-off-by: Guillaume Tardif <fdb6d90518c0d82cc6b9e4626ba807cce7a41bc7@docker.com>
docker/compose,docker/compose,docker/compose