[openstreetmap/openstreetmap-website] Add retina support (#104)

[Andy Allan]

I'm going to close this issue for various reasons:

* This site supports high-dpi map tiles, and has done for many years. You can see this on the "Cycle Map" and "Transport" layers, for example.
* The lack of support for high-dpi tiles from other providers will be solved by engaging with those providers directly, not by discussing it here. If you want the OSMF to serve high-dpi tiles, then that's a problem they need to solve (and let me be clear - everyone involved with both operating the servers and developing the stylesheets knows all about this, so please don't pester them - help them, yes, but please don't just pester). 
* When a specific provider has high-dpi tiles available, please open a request for us to enable them for that layer. Until then, there's nothing that we can do within this repo.
* There are some low-dpi images used in various places around the site (for example, the banner image on the copyright page). I'm keen to see those updated to have high-dpi variants, although it's not a current priority for the team. If you want to work on these assets (see the `app/assets/images` directory) please feel free to discuss these in separate issues.

I'm happy to clarify any of the above points.

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