[ROS2] Outdated command for "Via DockerHub" in /scripts/README.md for foxy

[DolceParadise]

Currently, the command to run the foxy RADI in the README.md file in the scripts folder of the foxy branch is as follows:

docker run -it \
      --rm \
      -v /tmp/.X11-unix:/tmp/.X11-unix \
      --name foxy_radi_container \
      -p 8000:8000 -p 2303:2303 -p 1905:1905 -p 8765:8765 -p 6080:6080 -p 1108:1108 \
      jderobot/robotics-academy:4.0.0 ./start.sh

This command runs the 4.0.0 docker image, which is not equipped with Rviz2 Web Templates. This should be changed to:

docker run -it \
      --rm \
      -v /tmp/.X11-unix:/tmp/.X11-unix \
      --name foxy_radi_container \
      -p 8000:8000 -p 2303:2303 -p 1905:1905 -p 8765:8765 -p 6080:6080 -p 1108:1108 -p 6081:6081 -p 1831:1831 -p 7681:7681 \
      jderobot/robotics-academy:4.2.0 ./start.sh