[openstreetmap-website] Simplify sign up (#894)

[Martijn van Exel]

I really like the flow proposed in the top answer for [this UX StackExchange question](http://ux.stackexchange.com/questions/23103/sign-up-double-opt-in-still-best-practice-what-about-mobile).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/894#issuecomment-73844931
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