Demo could include crawlable fact check results

## Description

As the owner of a FactCheck demo, I would like to make my results available to other services. This might be done via crawlable data as described at https://developers.google.com/search/docs/data-types/factcheck

The meta data could be provided together with the provenance of the demo (e.g., "Fact Checked by DICE Research (automatic)")

## Solution
- [ ] offer permanent URLs that can be used to get results of former checks
* URIs could be based on a REST API and a small DB that stores the fact check results
- [ ] make these URLs available so that other services can access them.