Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

@@ -1 +0,0 @@
-{"default": {"description": "The WikiMovies dataset consists of roughly 100k (templated) questions over 75k entities based on questions with answers in the open movie database (OMDb).\n", "citation": "@misc{miller2016keyvalue,\n      title={Key-Value Memory Networks for Directly Reading Documents},\n      author={Alexander Miller and Adam Fisch and Jesse Dodge and Amir-Hossein Karimi and Antoine Bordes and Jason Weston},\n      year={2016},\n      eprint={1606.03126},\n      archivePrefix={arXiv},\n      primaryClass={cs.CL}\n}", "homepage": "https://research.fb.com/downloads/babi/", "license": "Creative Commons Public License (CCPL)", "features": {"question": {"dtype": "string", "id": null, "_type": "Value"}, "answer": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "builder_name": "wiki_movies", "config_name": "default", "version": {"version_str": "1.1.0", "description": null, "major": 1, "minor": 1, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 7274490, "num_examples": 96185, "dataset_name": "wiki_movies"}, "test": {"name": "test", "num_bytes": 755258, "num_examples": 9952, "dataset_name": "wiki_movies"}, "validation": {"name": "validation", "num_bytes": 754755, "num_examples": 10000, "dataset_name": "wiki_movies"}}, "download_checksums": {"https://thespermwhale.com/jaseweston/babi/movieqa.tar.gz": {"num_bytes": 57070041, "checksum": "ed062b49922b602ebee6073f58951bf38c4772a8b53d46682f3ff80ed57de948"}}, "download_size": 57070041, "post_processing_size": null, "dataset_size": 8784503, "size_in_bytes": 65854544}}