add docs for psij deployment #728

Job	Run time
test-getting_started / tests	2m 43s
test-tutorials (configuration.ipynb) / tests	1m 38s
test-tutorials (debugging.ipynb) / tests	2m 11s
test-tutorials (describing_tasks.ipynb) / tests	3m 28s
test-tutorials (multiple_pilots.ipynb) / tests	3m 33s
test-tutorials (profiling.ipynb) / tests	2m 32s
test-tutorials (raptor.ipynb) / tests	2m 22s
test-tutorials (raptor_mpi.ipynb) / tests	3m 54s
test-tutorials (staging_data.ipynb) / tests	2m 26s
test-tutorials (submission.ipynb) / tests	1m 24s
	26m 11s

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