bug causes error uploading to huggingface, unicode issue on windows.

[resolver101757]

What this does

This PR resolves a bug in the LeRobot repository that causes an error when uploading a dataset to Huggingface on Windows due to a Unicode encoding issue. The problem arises because Windows, by default, uses cp1252 encoding, which cannot handle certain Unicode characters, such as emojis. The error is caused by the dataset card containing an emoji.

Error trace:

The error produced is 'Traceback (most recent call last):
File "D:\dev\lerobot\lerobot\scripts\control_robot.py", line 885, in
record(robot, **kwargs)
File "D:\dev\lerobot\lerobot\scripts\control_robot.py", line 681, in record
push_dataset_card_to_hub(repo_id, revision="main", tags=tags)
File "D:\dev\lerobot\lerobot\scripts\push_dataset_to_hub.py", line 124, in push_dataset_card_to_hub
card.push_to_hub(repo_id=repo_id, repo_type="dataset", revision=revision)
File "C:\Users\tblocal.conda\envs\lerobot\lib\site-packages\huggingface_hub\repocard.py", line 277, in push_to_hub
tmp_path.write_text(str(self))
File "C:\Users\tblocal.conda\envs\lerobot\lib\pathlib.py", line 1155, in write_text
return f.write(data)
File "C:\Users\tblocal.conda\envs\lerobot\lib\encodings\cp1252.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\U0001f917' in position 102: character maps to

This fix removes the emoji 🤗 which prevents UnicodeEncodeError.

How it was tested

• The script was run using the following command:

python lerobot/scripts/control_robot.py record --robot-path lerobot/configs/robot/koch_original.yaml --fps 30 --root data --repo-id RESOLVER101757/koch_test_2 --tags tutorial --warmup-time-s 5 --episode-time-s 30 --reset-time-s 30 --num-episodes 1

• The run proceeded without encountering the UnicodeEncodeError, confirming that the issue is resolved.

How to checkout & try? (for the reviewer)

1. Pull this branch.
2. Run the record command:

python lerobot/scripts/control_robot.py record --robot-path lerobot/configs/robot/koch_original.yaml --fps 30 --root data --repo-id RESOLVER101757/koch_test_2 --tags tutorial --warmup-time-s 5 --episode-time-s 30 --reset-time-s 30 --num-episodes 1

3. Verify that the command runs without the UnicodeEncodeError, and the dataset uploads successfully.