engine: add note about swarm usage

Signed-off-by: David Karlsson <david.karlsson@docker.com>

_includes/swarm-mode.md

@@ -0,0 +1,10 @@
+> **Note**
+>
+> Swarm mode is an advanced feature for managing a cluster of Docker daemons.
+>
+> Use Swarm mode if you intend to use Swarm as a production runtime environment.
+> 
+> If you're not planning on deploying with Swarm, use
+> [Docker Compose](/compose/) instead.
+> If you're developing for a Kubernetes deployment, consider using the
+> [integrated Kubernetes feature](/desktop/kubernetes/) in Docker Desktop.

engine/swarm/index.md

@@ -45,6 +45,8 @@ redirect_from:
 - /swarm/swarm_at_scale/troubleshoot/
 ---
 
+{% include swarm-mode.md %}
+
 To use Docker in swarm mode, install Docker. See
 [installation instructions](../../get-docker.md) for all operating systems and platforms.
 

get-started/swarm-deploy.md

@@ -6,6 +6,8 @@ redirect_from:
 - /get-started/part4/
 ---
 
+{% include swarm-mode.md %}
+
 ## Prerequisites
 
 - Download and install Docker Desktop as described in [Get Docker](../get-docker.md).