Replace hardcoded tables with initialisation from static data files

name: Feature
about: New features or wider changes

Closes #70

Description

Replace the hardcoded tables with initialization from a json file stored in static/data folder.

Changelog

• Added configuration file to setup mappings between URLs and IPs/ImagesIDs

How to test

• Set the environement variable SCW_FILE_DEFS
• launch the app locally
• start a visio, check that it works properly (BBB started on the right url)

Misc