feat: added initial dropdown to select reference dataset #1480

Job	Run time
build_neurostore	18s
style_check	15s
build_neurosynth_compose	58s
clean (neurosynth_compose)	4s
clean (compose_nginx)	3s
clean (compose_pgsql)	4s
clean (compose_worker)	2s
clean (neurostore)	2s
clean (store_nginx)	3s
clean (store_pgsql)	2s
neurostore_backend_tests	5m 7s
neurosynth_compose_JUNIT_tests	4m 9s
neurosynth_compose_cypress_tests	6m 0s
neurosynth_compose_backend_tests	2m 34s
	19m 41s

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