Issue title: Integrating UMap into OSM.org portal
 Issue body: I had the idea [to integrate UMap service into OSM.org portal](https://github.com/openstreetmap/openstreetmap-website/issues/1056) to make it more useful tool for the users. 

There is still no definitive answer if it is considered at all and what specific problems need to be solved (or even [what are the design goals and limits of the portal](https://github.com/openstreetmap/openstreetmap-website/issues/1038)), but I'd like to ask if there is any production server ready to be integrated somehow with it? Or maybe there are some plans to do so in the future?
 Comments: 
 Comment 0: I know this is discussed from time to time, but I've no personal opinion on this.
 Comment 1: The bottom line is not clear for you (what are the gains and problems then?) or you're just not much into it?
 Comment 2: See [this remark](https://github.com/openstreetmap/openstreetmap-website/issues/1056#issuecomment-156369810) about debugging "hidden" data using UMap.
 Comment 3: I would be happy to replace "share link" with "umap" link. Not only it provides more feature, it more intuitive to use and provides more instructions.

"Image download" section is especially penny97@example.com.
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