Add information about data sources to the readme and inform about the in the info message when user selects the project.
Rebuild Banner component to be dynamic and displays the first hero unit.
Also prepared infrastructure for A/B testing (all hero unit banners are loaded) - so just a logic that selects which banner to use based i.d. query string, etc could be used
Checklist
[ ] Code follows coding conventions held in this repo
[ ] Automated tests have been added
[ ] Tests are passing
[ ] Docs have been updated (if applicable)
[ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults
How to test
If manual testing is required, what are the steps?
Motivation
Fixes #60
Also, remove one hardcoded asset from #17
Checklist
How to test
If manual testing is required, what are the steps?