EPHEH-73: Color Schema POC - DO NOT MERGE
Created by: drishu
- define color schemas in the info yml
- the subtheme should override, not inherit these yml color schemas
- we could deliver some default color schemes (designers could present these to clients for out of box usage)
- we need to establish what is the minimal requirement for overriding elements on page level (content banner, menu background)
- deliver the field as a base field in a separate repo, and they could then be removed from display on project level next step: Prepare the demo, prepare 2 color schemes