Add warning about using sb3 algo on binder

These are indeed extremely slow on binder which makes them unusable for
now.

notebooks/11_maze_tuto.ipynb

@@ -17,7 +17,8 @@
     "Notes:\n",
     "- In order to focus on scikit-decide use, we put some code not directly related to the library in a [separate module](./maze_utils.py) (like maze generation and display).\n",
     "- A similar maze domain is already defined in [scikit-decide hub](https://github.com/airbus/scikit-decide/blob/master/skdecide/hub/domain/maze/maze.py) but we do not use it for the sake of this tutorial.\n",
-    "\n"
+    "- **Special notice for binder + sb3:**\n",
+    "it seems that [stable-baselines3](https://stable-baselines3.readthedocs.io/en/master/) algorithms are extremely slow on [binder](https://mybinder.org/). We could not find a proper explanation about it. We strongly advise you to either launch the notebook locally or on colab, or to skip the cells that are using sb3 algorithms (here PPO solver).\n"
    ]
   },
   {

notebooks/12_gym_tuto.ipynb

@@ -28,7 +28,10 @@
     "  - Wrap a gymnasium environment in a scikit-decide domain;\n",
     "  - Use a classical RL algorithm like PPO to solve our problem;\n",
     "  - Give CGP (Cartesian Genetic Programming)  a try on the same problem;\n",
-    "  - Finally use IW (Iterated Width) coming from the planning community on the same problem."
+    "  - Finally use IW (Iterated Width) coming from the planning community on the same problem.\n",
+    "\n",
+    "**Special notice for binder + sb3:**\n",
+    "it seems that [stable-baselines3](https://stable-baselines3.readthedocs.io/en/master/) algorithms are extremely slow on [binder](https://mybinder.org/). We could not find a proper explanation about it. We strongly advise you to either launch the notebook locally or on colab, or to skip the cells that are using sb3 algorithms (here PPO solver)."
    ]
   },
   {