Updating build so that contributors can build public docs

Changed base image

Signed-off-by: Mary Anthony <mary@docker.com>

docs/reference/start.md

@@ -4,6 +4,7 @@ title = "start"
 description = "Starts existing containers for a service."
 keywords = ["fig, composition, compose, docker, orchestration, cli,  start"]
 [menu.main]
+identifier="start.compose"
 parent = "smn_compose_cli"
 +++
 <![end-metadata]-->