Crushed Stone becomes Cobble
Crushed Cobble becomes Gravel
Crushed Gravel becomes Sand
Crushed Sandstone Variants become Sand
Crushed Red Sandstone Variants become Red Sand
Crushed Stone Bricks become Cracked Stone Bricks
Crushed Grass Block becomes Dirt
Crushed Farmland becomes Dirt

Download zip file
Place zip file in worlds datapack folder
Extract it
Delete the old zip file
/reload the world
/gamerule commandBlockOutput false recommended

Anvil smashes glass and stained glass variants
Anvil crushes concrete blocks into corresponding concrete powder blocks