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

[Tom Hughes]

One issue from a localisation point of view is the use of what I assume is an image that contains text (the site names) which is something that will be had to localise if different countries wanted to use different sites.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-21147390
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