Add warning about Linux being preferred and Windows not (macOS is in …

…the middle)

content/en/apps/guides/hosting/requirements.md

@@ -10,6 +10,11 @@ relatedContent: >
   core/guides/docker-setup
 ---
 
+
+{{% alert title="Note" %}}
+For production CHT deployments, Linux is recommended, with [Ubuntu](https://ubuntu.com/server) the most commonly used. For CHT development, Linux or macOS may be used. Windows can be used for either, but without recommendation.
+{{% /alert %}}
+
 Hosting a CHT instance in a cloud provider like AWS or on bare-metal requires you have sufficient hardware specifications, Docker and Docker Compose installed and other infrastructure requirements met.
 
 ## Hardware Requirements
@@ -68,4 +73,4 @@ There are serious implications to consider when deploying a CHT instance beyond
 * Scale - What happens when the hardware deployed needs to be upgraded to increase capacity?
 * Updates - By definition TLS certificates expire and software needs to be updated - how will the deployment get these updates on a regular basis?
 * Security - While the TLS certificate will protect data on the LAN, is the server hard drive encrypted in the event of property theft? 
-* Privacy - The CHT inherently carries sensitive patient medical information in the database. Are there sufficient measures in place to protect this sensitive data?  
+* Privacy - The CHT inherently carries sensitive patient medical information in the database. Are there sufficient measures in place to protect this sensitive data?