Package folder structure (#1417)

* Move files

* Replace imports & paths

* Update relative paths

* Update doc symlinks

* Update instructions paths

* Fix imports

* Update grpc files

* Update more instructions

* Downgrade grpc-tools

* Update manifest

* Update more paths

* Update config paths

* Update CI paths

* Update bandit exclusions

* Remove walkthrough section

tests/configs/test_plugin_loading.py

@@ -5,15 +5,15 @@ from typing import Generator
 
 import pytest
 
-from lerobot.common.envs.configs import EnvConfig
 from lerobot.configs.parser import PluginLoadError, load_plugin, parse_plugin_args, wrap
+from lerobot.envs.configs import EnvConfig
 
 
 def create_plugin_code(*, base_class: str = "EnvConfig", plugin_name: str = "test_env") -> str:
     """Creates a dummy plugin module that implements its own EnvConfig subclass."""
     return f"""
 from dataclasses import dataclass
-from lerobot.common.envs.configs import {base_class}
+from lerobot.envs.configs import {base_class}
 
 @{base_class}.register_subclass("{plugin_name}")
 @dataclass