Create/Update assets for version 21w18a

data/minecraft/structures/bastion/hoglin_stable/starting_pieces/_list.json

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+{"directories":[],"files":["stairs_0_mirrored.nbt","stairs_1_mirrored.nbt","stairs_2_mirrored.nbt","stairs_3_mirrored.nbt","stairs_4_mirrored.nbt","starting_stairs_0.nbt","starting_stairs_1.nbt","starting_stairs_2.nbt","starting_stairs_3.nbt","starting_stairs_4.nbt"]}