Delete legacy JSON metadata

Delete legacy `dataset_infos.json`.

dataset_infos.json

@@ -1 +0,0 @@
-{"en-me": {"description": "Opus MontenegrinSubs dataset for machine translation task, for language pair en-me: english and montenegrin", "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)", "homepage": "http://opus.nlpl.eu/MontenegrinSubs.php", "license": "", "features": {"translation": {"languages": ["en", "me"], "id": null, "_type": "Translation"}}, "post_processed": null, "supervised_keys": null, "builder_name": "opus_montenegrinsubs", "config_name": "en-me", "version": {"version_str": "1.0.0", "description": null, "major": 1, "minor": 0, "patch": 0}, "splits": {"train": {"name": "train", "num_bytes": 4896403, "num_examples": 65043, "dataset_name": "opus_montenegrinsubs"}}, "download_checksums": {"https://object.pouta.csc.fi/OPUS-MontenegrinSubs/v1/moses/en-me.txt.zip": {"num_bytes": 1990570, "checksum": "d09a6e2d1d1a31865fffe749d1179611d20d67fcf7d9cef8187053df6e113691"}}, "download_size": 1990570, "post_processing_size": null, "dataset_size": 4896403, "size_in_bytes": 6886973}}