[openstreetmap/openstreetmap-website] Add banner for SOTM Asia and Africa 2023 (PR #4308)

[Adam Hoyle]

@pnorman image is resized - I also switched from png to jpg as the file size is much smaller, but then noticed that the doc you shared specifies PNG but the existing fundraising image is a jpg (which is why I tried a jpg export). Jpg is considerably smaller so seems better for serving on a website, but I can revert to png if you prefer.

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