Add remarks of how to install Docker

Author: stevepiercy

docs/install/containers/index.md

@@ -24,7 +24,24 @@ examples/index
 
 ## Getting started
 
-Assuming you have [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/) already installed on your computer, you could try Plone 6.
+```{note}
+Although there are many container engine tools for developing, managing, and running containers, we will use {term}`Docker` in this documentation.
+```
+
+### Install Docker
+
+Install [Docker](https://docs.docker.com/get-docker/) for your operating system.
+
+Docker Desktop includes all Docker tools.
+Both macOS and Windows use Docker Desktop.
+On some Linux distributions a beta version of Docker Desktop is available.
+If Docker Desktop is not available for your Linux distribution, you may still install Docker Engine and all of its tools.
+Consult [Get Docker](https://docs.docker.com/get-docker/) for details.
+
+{term}`Docker Compose` is one of the Docker tools that will be used throughout this documentation.
+
+
+### Start Plone
 
 First start the Plone Backend, naming it `plone6-backend` and creating a site with its default configuration, using the following command.
 
@@ -38,6 +55,7 @@ Now start the Plone Frontend, linking it to the `plone6-backend`:
 docker run --name plone6-frontend --link plone6-backend:backend -e RAZZLE_API_PATH=http://localhost:8080/Plone -e RAZZLE_INTERNAL_API_PATH=http://backend:8080/Plone -d -p 3000:3000 plone/plone-frontend:latest
 ```
 
+
 ## Access your Plone site
 
 Point your browser to `http://localhost:3000` and you should see the new Plone site.
@@ -46,6 +64,7 @@ Point your browser to `http://localhost:3000` and you should see the new Plone s
 The default user is `admin` and the password is `admin`.
 ```
 
+
 ## Shutdown and cleanup
 
 To stop and clean up the containers use the following commands.
@@ -55,6 +74,7 @@ docker stop plone6-frontend && docker rm plone6-frontend
 docker stop plone6-backend && docker rm plone6-backend
 ```
 
+
 ## Next steps
 
 Get to know the [Official Images](images/index) maintained by the Plone community.