[openstreetmap-website] Convert user navigation to a dropdown menu (#447)

[Martin Raifer]

How to reproduce the 500 error (I'm using the test environment @tomhughes set up):

1. create new account
2. in the settings use "Add an image" to upload a custom avatar image
3. in the settings use "Remove the current image" to delete this avatar
4. 500 error :(

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/447#issuecomment-22714974
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