[openstreetmap-website] Gravatar support (#131)

[Paweł Paprota]

I tried to rethink how user images are displayed but it ended up in user page redesign attempt... out of scope for this task I think.

I tested what's been implemented and it works for me so I'd suggest merging it (unless you have more comments of course) and take care of image sizes in another task.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/131#issuecomment-9483268
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