[openstreetmap-website] Remove Donate Ad Banner (#458)

[Grant]

Remove banner as donation drive is ending shortly.
You can merge this Pull Request by running:

  git pull https://github.com/Firefishy/openstreetmap-website master

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

  https://github.com/openstreetmap/openstreetmap-website/pull/458

-- Commit Summary --

  * Remove Donate Ad Banner

-- File Changes --

    D app/assets/images/donate-ad.png (0)
    M app/views/layouts/site.html.erb (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/458.patch
https://github.com/openstreetmap/openstreetmap-website/pull/458.diff

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