Changes to docs

[rahelwoldeyes]

https://chanzuckerberg.github.io/saber/tutorials/preprocessing/

1. Full tomogram segmentation (segment the entire 3D tomgoram):

saber segment tomograms
--config config.json
--voxel-size 10 --tomo-alg denoised --slab-thickness 10
--run-id Position_10_Vol

saber segment tomograms \
    --config config.json \
    --voxel-size 10 --tomo-alg denoised --slab-thickness 10 \
    --run-ids Position_10_Vol

2. Generate comprehensive slab-based segmentations that maintain 3D context:

saber classifier prep3d
--config config.json
--zarr-path output_zarr_fname.zarr
--num-slabs 3

saber classifier prep3d \
    --config config.json \
    --output output_zarr_fname.zarr \
    --num-slabs 3