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

[Saman Bemel-Benrud]

As part of improving the welcome flow, I started a new 'verify e-mail' page (addressing #399) and added it to this pull request. @jfirebaugh do you think you could hook this up properly on the rails side? 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-21872537
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