fix: sort routes without start_time/end_time

[tex-murphy]

• falls back to create_time when start_time/end_time are unavailable
• refactor <RouteHeader /> into its own file
• hide <RouteStatistics /> if there's no trip data

closes #60

[tex-murphy]

screenshot (with time-less trip on the bottom)

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[tex-murphy]

@incognitojam @adeebshihadeh I believe this should squash web bounty #60

any suggestions for moving this forward -- I can add mock data for this case if there's a good place to put that.