feat: default `data download gtfs` to the Transitous catalog when --f… #103

Job	Run time
build (api, ., apps/api/Dockerfile)	3m 32s
build (web, ., apps/web/Dockerfile)	5m 33s
build (data-manager, services/data-manager, services/data-manager/Dockerfile)	1m 2s
	10m 7s

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