Add Parquet shard 15/15

Add Parquet shard 14/15

Add Parquet shard 13/15

Add Parquet shard 12/15

Add Parquet shard 11/15

Add Parquet shard 10/15

Add Parquet shard 9/15

Add Parquet shard 8/15

Add Parquet shard 7/15

Add Parquet shard 6/15

Add Parquet shard 5/15

Add Parquet shard 4/15

Add Parquet shard 3/15

Add Parquet shard 2/15

Add Parquet shard 1/15

Remove raw txt (replaced by Parquet shards)

Add logic_pretrain.txt (~100M tokens)