Switching to 5.0

[johannrichard]

• Updated the Docker file and scripts to use v5.0 (incl. updated /opt/ path)
• Fixed missing pytz in Dockerfile
• Some housekeeping
• Added an updated trial license (I hope you don't grill me for that)
• Built and tested over at https://hub.docker.com/r/johannrichard/docker-websafety/
• My own response to a tweet asking whether @team-diladele will update the Docker image at some point to v5.0 :-)
• Apologies for the many commits. I'm still learning and struggling to use git properly in projects

[ra-at-diladele-com]

Thanks a lot Johann!! Starting the review...