Move BLEUBERI environment to community folder

- Moved environments/bleuberi to environments/community/bleuberi
      - Updated .gitmodules to reflect new submodule path
      - Fixed pre-commit formatting issues
      - Cleaned up test output files

environments/community/bleuberi/__init__.py

@@ -0,0 +1,12 @@
+"""
+BLEUBERI: BLEU-based environment for instruction following.
+
+This environment uses BLEU scores as a reward function for training
+models to follow instructions. Based on the paper:
+"BLEUBERI: BLEU is a surprisingly effective reward for instruction following"
+https://arxiv.org/abs/2505.11080
+"""
+
+__all__ = ["BLEUBERIEnv"]
+
+from .bleuberi_env import BLEUBERIEnv  # noqa