Transport chapter failing due to upstream issue

[Robinlovelace]

Seems an openstreetmap.de server issue: ropensci/stplanr#568

[Robinlovelace]

Re-opening because we should revert b848389 when the endpoint is alive again.

[Robinlovelace]

It's still dead: https://routing.openstreetmap.de/routed-bike