Add reference docs for push and bundle.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

docs/reference/bundle.md

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+<!--[metadata]>
++++
+title = "bundle"
+description = "Create a distributed application bundle from the Compose file."
+keywords = ["fig, composition, compose, docker, orchestration, cli,  bundle"]
+[menu.main]
+identifier="bundle.compose"
+parent = "smn_compose_cli"
++++
+<![end-metadata]-->
+
+# bundle
+
+```
+Usage: bundle [options]
+
+Options:
+    --push-images              Automatically push images for any services
+                               which have a `build` option specified.
+
+    -o, --output PATH          Path to write the bundle file to.
+                               Defaults to "<project name>.dab".
+```
+
+Generate a Distributed Application Bundle (DAB) from the Compose file.
+
+Images must have digests stored, which requires interaction with a
+Docker registry. If digests aren't stored for all images, you can fetch
+them with `docker-compose pull` or `docker-compose push`. To push images
+automatically when bundling, pass `--push-images`. Only services with
+a `build` option specified will have their images pushed.

docs/reference/push.md

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+<!--[metadata]>
++++
+title = "push"
+description = "Pushes service images."
+keywords = ["fig, composition, compose, docker, orchestration, cli,  push"]
+[menu.main]
+identifier="push.compose"
+parent = "smn_compose_cli"
++++
+<![end-metadata]-->
+
+# push
+
+```
+Usage: push [options] [SERVICE...]
+
+Options:
+    --ignore-push-failures  Push what it can and ignores images with push failures.
+```
+
+Pushes images for services.