[openstreetmap-website] Routing (#716)

[Ilya Zverev]

>From #osm-dev, I propose three improvements, keeping the "get directions" tiny link:

1. open directions panel with /directions url
2. when opening the panel (either by clicking "get directions" link or following the url, prefill "from" field with the center of the map
3. add "reverse route" button

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/716#issuecomment-39125417
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