Update DPR README for projection trial

Update DPR projection trial: tokenizer_config.json

Update DPR projection trial: config.json

Update DPR projection trial: model_last.pt

Update DPR projection trial: model.pt

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Upload vocab.txt with huggingface_hub

Upload tokenizer_config.json with huggingface_hub

Upload bpe.codes with huggingface_hub

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