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

[Paul Norman]

Can you confirm SOTM Asia and Africa both have a [SOTM Quick Licence](https://osmfoundation.org/wiki/SOTM_Quick_Licence) as per the [banner policy](https://operations.osmfoundation.org/policies/banner/)?

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