Improve dataset card: metadata, usage, citation

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Limit viewer configs to JSONL files

Fix dataset card metadata and viewer configs

Normalize dataset for dataset_infos.json

Normalize dataset for pashto_val_prompt_completion.jsonl

Normalize dataset for pashto_train_prompt_completion.jsonl

Normalize dataset for pashto_train_instruction.jsonl

Enhance README.md with detailed dataset information and usage guidelines

Update README.md

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