[openstreetmap/openstreetmap-website] Point at new OSRM demo server (#1637)

[Will White]

The OSRM Demo Server is down and we're now using the Mapbox API as the official OSRM demo. This PR switches to point at the Mapbox Directions API, which has nearly an identical API. The only thing we don't support right now is the `hints` parameter, so I removed that in this PR. The access token included here should give plenty of headroom to avoid interruptions in the future.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1637

-- Commit Summary --

  * Remove hints parameter.
  * Update OSRM URL in example config.

-- File Changes --

    M app/assets/javascripts/index/directions/osrm.js (17)
    M config/example.application.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1637.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1637.diff

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