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

[Adam Hoyle]

@atomoil pushed 1 commit.

441be268d8c45a61b649b171e244f1916da93649  Fix file dimensions and switch from png to jpg

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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/4308/files/73bba0a9b63c3513a7421aff068b00a97e2762fa..441be268d8c45a61b649b171e244f1916da93649
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