[openstreetmap-website] Add link to forum on help page (#718)

[Paweł Marynowski]

On [Getting Help](https://www.openstreetmap.org/help) page, there should be link to [OSM forum](http://forum.osm.org). For some countries it is main place for asking questions.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/718
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