[openstreetmap/openstreetmap-website] Display a link for mapillary keys (#986)

[Bibi56]

Not doing that has some bad extra side effects, visible [here](https://www.openstreetmap.org/way/739027745):

- full url usage where ID is the correct value i.e mapillary=https://www.mapillary.com/map/im/4mayqgUw7QEHXjeTAXT5nw instead of mapillary=4mayqgUw7QEHXjeTAXT5nw
- duplicate storage: also referenced as image=https://images.mapillary.com/4mayqgUw7QEHXjeTAXT5nw/thumb-2048.jpg

As said in the ticket [2405](https://github.com/openstreetmap/openstreetmap-website/issues/2405#issuecomment-548917729) we have a good hint to make it almost maintenance free.

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