Update instructions

docker/README.md

@@ -5,10 +5,18 @@ To build the image manually for testing on a local host for the native architect
 
 `docker build -t briansimulator/brian -f docker/Dockerfile .`
 
-Alternatively, to test multi-architeture builds and push to docker hub, use:
+Alternatively, to test multi-architecture builds and push to docker hub, first login:
+
+`docker login`
+
+Then execute:
 
 `docker buildx build --push --platform linux/amd64,linux/arm64/v8 -o type=image -t briansimulator/brian -f docker/Dockerfile .`
 
-Then to run the image:
+Finally, to run the image:
+
+`docker run -it --init -p 8888:8888 briansimulator/brian`
+
+Or if you prefer a simple `bash` terminal rather than JupyterLab:
 
-`docker run -it --init --rm -p 8888:8888 briansimulator/brian`
+`docker run -it --init briansimulator/brian /bin/bash`