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

[Tom MacWright]

> I think that any mention of companies and brand names must be removed until we have an agreement on what makes a brand name suitable to be mentioned here.

Please propose other ideas or ways to fairly choose what to point to, or specific examples if you have any in mind.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-21077536
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