Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

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-{"wikitext-tl-39": {"description": "Large scale, unlabeled text dataset with 39 Million tokens in the training set. Inspired by the original WikiText Long Term Dependency dataset (Merity et al., 2016). TL means \"Tagalog.\" Originally published in Cruz & Cheng (2019).\n", "citation": "@article{cruz2019evaluating,\n  title={Evaluating Language Model Finetuning Techniques for Low-resource Languages},\n  author={Cruz, Jan Christian Blaise and Cheng, Charibeth},\n  journal={arXiv preprint arXiv:1907.00409},\n  year={2019}\n}\n", "homepage": "https://github.com/jcblaisecruz02/Filipino-Text-Benchmarks", "license": "GPL-3.0", "features": {"text": {"dtype": "string", "id": null, "_type": "Value"}}, "post_processed": null, "supervised_keys": null, "builder_name": "wikitext_tl39", "config_name": "wikitext-tl-39", "version": {"version_str": "1.0.0", "description": null, "major": 1, "minor": 0, "patch": 0}, "splits": {"test": {"name": "test", "num_bytes": 46182996, "num_examples": 376737, "dataset_name": "wikitext_tl39"}, "train": {"name": "train", "num_bytes": 217182748, "num_examples": 1766072, "dataset_name": "wikitext_tl39"}, "validation": {"name": "validation", "num_bytes": 46256674, "num_examples": 381763, "dataset_name": "wikitext_tl39"}}, "download_checksums": {"https://s3.us-east-2.amazonaws.com/blaisecruz.com/datasets/wikitext-tl-39/wikitext-tl-39.zip": {"num_bytes": 116335234, "checksum": "261ad06d7afc09058dfbf1d878ff5e2902b34e0145a34285af3f88badd4056b6"}}, "download_size": 116335234, "post_processing_size": null, "dataset_size": 309622418, "size_in_bytes": 425957652}}