[openstreetmap/openstreetmap-website] Add FAQ and information about creating a banner image (#1580)

[Bryan Housel]

@bhousel pushed 1 commit.

c555c91  Clarify image dimensions


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1580/files/ee04490f7ccfd5de38a56c263d72bd58c50c06c5..c555c912047c8d0d23123093a729aa87ca642aee
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