Add new workflow stitch_only and update documentation #166

Job	Run time
Get Shards	14s
GPU Test \| singularity \| 2 \| 25.10.3 \| pipeline	28m 43s
GPU Test \| singularity \| 1 \| 25.10.3 \| pipeline	16m 35s
GPU Test \| docker \| 1 \| 25.10.3 \| pipeline	9m 3s
GPU Test \| docker \| 2 \| 25.10.3 \| pipeline	24m 29s
confirm-pass	5s
	1h 19m 9s

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