Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

@@ -1 +0,0 @@
-{"en-fr": {"description": "Giga-word corpus for French-English from WMT2010 collected by Chris Callison-Burch\n2 languages, total number of files: 452\ntotal number of tokens: 1.43G\ntotal number of sentence fragments: 47.55M\n", "citation": "J. Tiedemann, 2012, Parallel Data, Tools and Interfaces in OPUS. In Proceedings of the 8th International Conference on Language Resources and Evaluation (LREC 2012)\n", "homepage": "http://opus.nlpl.eu/giga-fren.php", "license": "", "features": {"id": {"dtype": "string", "id": null, "_type": "Value"}, "translation": {"languages": ["en", "fr"], "id": null, "_type": "Translation"}}, "post_processed": null, "supervised_keys": null, "builder_name": "giga_fren", "config_name": "en-fr", "version": {"version_str": "2.0.0", "description": "", "major": 2, "minor": 0, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 8690296821, "num_examples": 22519904, "dataset_name": "giga_fren"}}, "download_checksums": {"https://object.pouta.csc.fi/OPUS-giga-fren/v2/moses/en-fr.txt.zip": {"num_bytes": 2701536198, "checksum": "26b03b0b944829cc125c37542a50a62a47fcf77ca1ebab0c41eb1f84f8a4e6d1"}}, "download_size": 2701536198, "post_processing_size": null, "dataset_size": 8690296821, "size_in_bytes": 11391833019}}