[openstreetmap/openstreetmap-website] Add dark theme for OSM site and ID editor, depending on color theme (#2532)

[Anton]

![image](https://user-images.githubusercontent.com/518939/74336587-3c041880-4da7-11ea-8ef0-ed29aed71dc7.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2532

-- Commit Summary --

  * add dark theme for OSM site and ID editor, depending on color theme in browser or system

-- File Changes --

    A app/assets/stylesheets/_dark_theme.scss (1630)
    M app/assets/stylesheets/common.scss (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2532.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2532.diff

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