Update README: document Topcon WebDataset shards & quickstart

Remove legacy loose images; migrate fully to WebDataset TAR shards

Remove test probe

Topcon images: images_shard_061.tar (part 62/62)

Topcon images: images_shard_060.tar (part 61/62)

Topcon images: images_shard_059.tar (part 60/62)

Topcon images: images_shard_058.tar (part 59/62)

Topcon images: images_shard_057.tar (part 58/62)

Topcon images: images_shard_056.tar (part 57/62)

Topcon images: images_shard_055.tar (part 56/62)

Topcon images: images_shard_054.tar (part 55/62)

Topcon images: images_shard_053.tar (part 54/62)

Topcon images: images_shard_052.tar (part 53/62)

Topcon images: images_shard_051.tar (part 52/62)

Topcon images: images_shard_050.tar (part 51/62)

Topcon images: images_shard_049.tar (part 50/62)

Topcon images: images_shard_048.tar (part 49/62)

Topcon images: images_shard_047.tar (part 48/62)

Topcon images: images_shard_046.tar (part 47/62)

Topcon images: images_shard_045.tar (part 46/62)

Topcon images: images_shard_044.tar (part 45/62)

Topcon images: images_shard_043.tar (part 44/62)

Topcon images: images_shard_042.tar (part 43/62)

Topcon images: images_shard_041.tar (part 42/62)

Topcon images: images_shard_040.tar (part 41/62)

Topcon images: images_shard_039.tar (part 40/62)

Topcon images: images_shard_038.tar (part 39/62)

Topcon images: images_shard_037.tar (part 38/62)

Topcon images: images_shard_036.tar (part 37/62)

Topcon images: images_shard_035.tar (part 36/62)

Topcon images: images_shard_034.tar (part 35/62)

Topcon images: images_shard_033.tar (part 34/62)

Topcon images: images_shard_032.tar (part 33/62)

Topcon images: images_shard_031.tar (part 32/62)

Topcon images: images_shard_030.tar (part 31/62)

Topcon images: images_shard_029.tar (part 30/62)

Topcon images: images_shard_028.tar (part 29/62)

Topcon images: images_shard_027.tar (part 28/62)

Topcon images: images_shard_026.tar (part 27/62)

Topcon images: images_shard_025.tar (part 26/62)

Topcon images: images_shard_024.tar (part 25/62)

Topcon images: images_shard_023.tar (part 24/62)

Topcon images: images_shard_022.tar (part 23/62)

Topcon images: images_shard_021.tar (part 22/62)

Topcon images: images_shard_020.tar (part 21/62)

Topcon images: images_shard_019.tar (part 20/62)

Topcon images: images_shard_018.tar (part 19/62)

Topcon images: images_shard_017.tar (part 18/62)

Topcon images: images_shard_016.tar (part 17/62)

Topcon images: images_shard_015.tar (part 16/62)