[openstreetmap-website] remove SOTM US from the banner rotation (#296)

[Harry Wood]

Remove SOTM US image from the from the front page banner rotation, leaving only main SOTM and server donation drive ads.
You can merge this Pull Request by running:

  git pull https://github.com/harry-wood/openstreetmap-website patch-1

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/296

-- Commit Summary --

  * remove SOTM US from the banner rotation

-- File Changes --

    M app/views/layouts/site.html.erb (3)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/296.patch
https://github.com/openstreetmap/openstreetmap-website/pull/296.diff

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