[openstreetmap-website] Update to iD v1.8.0 (#1081)

[Tom Hughes]

I've opened https://github.com/toy/image_optim/pull/110 to add support for disabling svgo plugins so we can disable the `cleanupIDs` plugin...

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1081#issuecomment-155048472
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