[openstreetmap/openstreetmap-website] Use svg default avatar image on webpages (PR #4671)

[Anton Khorev]

Updated to use `bg-body` background:
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/c2851c36-9d8d-43dd-9313-63a7854cc455)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/c51329e4-487d-4541-b137-57c59d3d3c49)


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