[openstreetmap-website] Added links to the relevant OSMF sites and some additional text (#963)

[simonpoole]

The 2 commit add links to to various useful resources to the help page.  IIRC the mailing lists and forums where left oft due to convolulted arguments that beginners might be offended by the contents.

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https://github.com/openstreetmap/openstreetmap-website/pull/963#issuecomment-98486605
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