Rename property prefix from the external configuration file after first seed4j release

TO-DO
- [ ] At `Command.md` docs
- [ ] At test resource file

Rename from:

```yaml
jhlite:
  hidden-resources:
    slugs:
      - gradle-java
    tags:
```

To:

````yaml
seed4j:
  hidden-resources:
    slugs:
      - gradle-java
    tags:
````