Pull the location and board data from a database back-end

[MrCsabaToth]

The app would have a pre-configured off-line data for faster start-up and if the user doesn't have connection. However we could download fresher data in the background (in case we wouldn't have the latest already by timestamp) so the app could present the most current distribution fo the signs on the AR scene.

This would require internet app privileges added and the app would connect read-only to a Firebase or some exposed free, read-only data repository (GitHub or GitLab hosted?).