subscriptions in the MAST API #71

Job	Run time
notebook-ci / setup-matrix	42s
notebook-ci / validate-jupyter-book (notebooks/multi_mission/subscriptions/subscriptions.ipynb)	57s
notebook-ci / process-notebooks (notebooks/multi_mission/subscriptions/subscriptions.ipynb)	48s
notebook-ci / manage-deprecation	-1s
notebook-ci / store-non-notebook-files	-1s
notebook-ci / workflow-summary	30s
notebook-ci / build-documentation	0s
	2m 55s

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