Hacktober Surprise

[karldreher]

This is a monster-sized PR which includes several big enhancements and fixes:

• Inclusion of new contributing guidelines.
• Introduction of docker container scanning for the first "CI" implementation for this project
• Fix of several major vulnerabilities in the docker image, including changing to a non-priveleged user to run the app in the container
• Improvement of Docker build process to adopt several best practices and optimizations, including a mechanism to check container health
• Fixing some data quality issues which in turn generated errors on the front end, #31
• Providing a better API-like response which is deeplinkable (e.g. /port/22)
• Overall improvements to python programs and build process.