Update docs: remove PowerShell script in docker-compose section

docs/tutorial/using-docker-compose/index.md

@@ -49,7 +49,7 @@ And now, we'll start migrating a service at a time into the compose file.
 
 ## Defining the App Service
 
-To remember, this was the command we were using to define our app container.
+To remember, this was the command we were using to define our app container:
 
 ```bash
 docker run -dp 3000:3000 \
@@ -63,20 +63,6 @@ docker run -dp 3000:3000 \
   sh -c "yarn install && yarn run dev"
 ```
 
-If you are using PowerShell then use this command.
-
-```powershell
-docker run -dp 3000:3000 `
-  -w /app -v "$(pwd):/app" `
-  --network todo-app `
-  -e MYSQL_HOST=mysql `
-  -e MYSQL_USER=root `
-  -e MYSQL_PASSWORD=secret `
-  -e MYSQL_DB=todos `
-  node:12-alpine `
-  sh -c "yarn install && yarn run dev"
-```
-
 1. First, let's define the service entry and the image for the container. We can pick any name for the service. 
    The name will automatically become a network alias, which will be useful when defining our MySQL service.
 
@@ -170,17 +156,6 @@ docker run -d \
   mysql:5.7
 ```
 
-If you are using PowerShell then use this command.
-
-```powershell
-docker run -d `
-  --network todo-app --network-alias mysql `
-  -v todo-mysql-data:/var/lib/mysql `
-  -e MYSQL_ROOT_PASSWORD=secret `
-  -e MYSQL_DATABASE=todos `
-  mysql:5.7
-```
-
 1. We will first define the new service and name it `mysql` so it automatically gets the network alias. We'll
    go ahead and specify the image to use as well.