Delete math_pile/textbooks

Upload math_pile/wikipedia/train-00001-of-00001.json with huggingface_hub (#18)

Upload math_pile/proofwiki/train-00001-of-00001.json with huggingface_hub (#17)

Delete math_pile/common_crawl

Delete math_pile/arxiv/empty

Delete math_pile/stackexchange/empty

Create wikipedia/empty

Create proofwiki/empty

Create stackexchange/empty

Create textbooks/empty

Create common_crawl/empty

Create arxiv/empty

Create math_pile/empty