Refactor the SDXL utility class to improve JSON data handling. Update the data structure of the JSON files and remove unused files. This improves the maintainability and efficiency of the codebase.
The commit removes the unused JSON files `groups.json` and `festivities.json` from the `data/next` directory. Additionally, it updates the data structure of the remaining JSON files `human/groups.json` and `human/festivities.json` to improve readability and organization. This commit improves the maintainability and efficiency of the codebase.