[openstreetmap-website] Add 'x' to close welcome box; remember preference (#582)

[Richard Fairhurst]

You can merge this Pull Request by running:

  git pull https://github.com/systemed/openstreetmap-website close_about

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

  https://github.com/openstreetmap/openstreetmap-website/pull/582

-- Commit Summary --

  * Add 'x' to close welcome box; remember preference

-- File Changes --

    M app/assets/javascripts/index.js (10)
    M app/views/layouts/map.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/582.patch
https://github.com/openstreetmap/openstreetmap-website/pull/582.diff
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