Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

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-{"default": {"description": "The Hindi Discourse Analysis dataset is a corpus for analyzing discourse modes present in its sentences. \nIt contains sentences from stories written by 11 famous authors from the 20th Century. \n4-5 stories by each author have been selected which were available in the public domain resulting \nin a collection of 53 stories. Most of these short stories were originally written in Hindi \nbut some of them were written in other Indian languages and later translated to Hindi.\n", "citation": "@inproceedings{swapnil2020,\n    title={An Annotated Dataset of Discourse Modes in Hindi Stories},\n    author={Swapnil Dhanwal, Hritwik Dutta, Hitesh Nankani, Nilay Shrivastava, Yaman Kumar, Junyi Jessy Li, Debanjan Mahata, Rakesh Gosangi, Haimin Zhang, Rajiv Ratn Shah, Amanda Stent},\n    booktitle={Proceedings of the 12th Conference on Language Resources and Evaluation (LREC 2020)},\n    volume={12},\n    pages={1191\u20131196},\n    year={2020}\n", "homepage": "https://github.com/midas-research/hindi-discourse", "license": "", "features": {"Story_no": {"dtype": "int32", "id": null, "_type": "Value"}, "Sentence": {"dtype": "string", "id": null, "_type": "Value"}, "Discourse Mode": {"num_classes": 6, "names": ["Argumentative", "Descriptive", "Dialogue", "Informative", "Narrative", "Other"], "names_file": null, "id": null, "_type": "ClassLabel"}}, "post_processed": null, "supervised_keys": null, "builder_name": "hindi_discourse", "config_name": "default", "version": {"version_str": "1.0.0", "description": null, "major": 1, "minor": 0, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 1998930, "num_examples": 9968, "dataset_name": "hindi_discourse"}}, "download_checksums": {"https://raw.githubusercontent.com/midas-research/hindi-discourse/master/discourse_dataset.json": {"num_bytes": 4176677, "checksum": "d27b447e383686213f9936467ec9fbc9e44fa0aebd3f8000865f605a5b3d4ab0"}}, "download_size": 4176677, "post_processing_size": null, "dataset_size": 1998930, "size_in_bytes": 6175607}}