Update dev container command in README

Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

README.md

@@ -20,7 +20,7 @@ This command starts a local development server and opens up a browser window. Mo
 
 You can also use Docker to launch the website without needing to install and configure yarn:
 ```
-docker run --rm -it -v $PWD:$PWD -w $PWD -p 3000:3000 node yarn start -h 0.0.0.0
+docker run --rm -d --name k3s-docs -v $PWD:$PWD -w $PWD -p 3000:3000 node sh -c 'yarn; yarn start -h 0.0.0.0'
 ```
 
 ### Build