[openstreetmap/openstreetmap-website] add banner for state of the map 2020 (#2684)

[Martin Raifer]

it's this weekend, but since the conference is online anyway, it's still relevant perhaps?
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2684

-- Commit Summary --

  * add sotm 2020 banner (image still missing)
  * add sotm2020 banner asset
  * fix link to sotm2020 website

-- File Changes --

    A app/assets/images/banners/sotm_2020.png (0)
    M config/banners.yml (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2684.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2684.diff

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