Improve docs in Dockerfile

Dockerfile

@@ -4,14 +4,12 @@
 # ```
 # git clone gitlab.camras.nl/dijkema/dt_ctrl
 # ```
-# Copy the Dockerfile to the empty directory: `cp dt_ctrl/Dockerfile .`
-# Tar the source code with `tar czf dt_ctrl.tgz dt_ctrl`
 # Create the docker file with `docker build --tag consoledemo .`
 # This Dockerfile is hardcoded to run the websockets server at
 # port 8000.
 # Start the docker container with
-# docker run -it -p 8081:80 -p 8000:8000 consoledemo
-# Then visit the consoledemo from the host machine at http://localhost:8081
+# docker run -it -p 8081:80 -p 8000:8000 -p 11031:11031 -p 11030:11030 -p 11040:11040 -p 11041:11041 -p 11042:11042 -p 11011:11011 consoledemo
+# Then visit the consoledemo from the host machine at http://localhost:8081 (NOT at port 8000, which will show a non-working HTML page)
 FROM ubuntu:16.04
 
 RUN apt-get -y update