[openstreetmap/openstreetmap-website] Allow exporting direction path tracks (Issue #5224)

[mmd]

I have updated the example URLs from above to only require start lat/lon and end lat/lon values as well as a profile. 

* Valhalla: `https://valhalla.openstreetmap.de/directions?profile=pedestrian&wps=120.8635823%2C24.1893169%2C120.8648163%2C24.1825192`
* OSRM: `https://routing.openstreetmap.de/?loc=24.189317%2C120.863582&loc=24.182519%2C120.864816&srv=2`
* GraphHopper: `https://graphhopper.com/maps/?point=24.18978%2C120.86377&point=24.18252%2C120.86482&profile=foot`

For the profile values, I'd suggest the following mapping table:

  | Car | Bicycle | Foot
-- | -- | -- | --
Valhalla | car | bicycle | pedestrian
OSRM | 0 | 1 | 2
GraphHopper | car | bike | foot


OSRM (FOSSGIS) is a bit special, since the values appear to be derived from the sequence in https://github.com/fossgis-routing-server/cbf-routing-profiles/blob/master/profiles.conf.example#L2 ... the profile values are valid for the FOSSGIS instance only.

I think that's probably all we need to generate URLs similar to Nominatim.

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