[openstreetmap/openstreetmap-website] add banner for SotM 2021 (#3229)

[Paul Norman]

@pnorman requested changes on this pull request.

The [FAQ](https://github.com/openstreetmap/openstreetmap-website/blob/70d7d8d850148f714b70a3297c02a8203214dec6/FAQ.md#how-do-i-create-a-banner-to-promote-my-openstreetmap-event) states
> Note that a close 'X' button will be drawn over the top right 60x60px corner of the banner, so please do not put anything important in that space.

This overlaps with about half of the F in "OF"



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