Adjust paths after repository rename

In `.env` we define 
```
DOCKER_REGISTRY=docker.pkg.github.com/jvalue/open-data-service
```

Do we need to / should we change that, now that the repository is called *jvalue/ods*?

All `package.json` files also still refer to the old repository url, e.g. here: https://github.com/jvalue/ods/blob/main/ui/package.json#L50

And of course the CI badge in the `README.md`.

