[openstreetmap-website] Add welcome page (#338)

[simonpoole]

A number of the non-English language versions of the "welcome message" have very different content than the standard one, some thought has to go in to either incorporating such text in to the landing page or working out how a standard page would interact with such expanded messages. 



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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-21079436
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