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

[Paul Norman]

on medium-narrow pages there's a minor bug with the lower arm overlapping "free". If you make the window narrower the arm disappears, but for a narrow range of widths it overlaps.
![signup_overlap](https://f.cloud.github.com/assets/1190866/949227/9389b184-0379-11e3-8306-531fa90226bd.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-22512792
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