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

[Paul Norman]

On the new signup page the CT textarea is absurdly small on large (1080p) monitors. This is a regression from the current behaviour which uses the available screen width, although not much height.
![welcome_cts](https://f.cloud.github.com/assets/1190866/908915/711347b0-fdab-11e2-9cb7-9bcfd286e8d8.png)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-22093779
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