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

[Paul Norman]

> The contributor terms page also doesn't seem optimal for narrow screens, as a bunch of text doesn't use the full with of the screen and is even narrower than the narrow screen already.

The highest whitespace/width ratio was this
![ct_narrow](https://f.cloud.github.com/assets/1190866/949266/4b616950-037a-11e3-8401-31d7812745a3.png)

We probably don't want to be using a narrow column on the small screen layout

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https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-22513120
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