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

[Paul Norman]

Because I haven't seen a screenshot of the sent email screen, here one is

![welcome_sent](https://f.cloud.github.com/assets/1190866/908938/674105be-fdac-11e2-9da1-ae1b4f0f48ed.png)



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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-22094007
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