add github of contributors
@lhoestq Can you confirm if this format is fine? I will update cards based on your feedback. On HuggingFace side we also have a mapping of hf user => github user (GitHub info used to be required when signing up until not long ago – cc @gary149 @beurkinger) so we can also add a link to HF profile All the dataset cards have been updated with GitHub ids :)
This PR will add contributors GitHub id at the end of every dataset cards.