[openstreetmap/openstreetmap-website] Add white shadow to browse icons (PR #4701)

[Anton Khorev]

Another option: increase brightness in dark mode

```
@include color-mode(dark) {
  .browse-section {
    .node::before,
    .way::before,
    .relation::before {
      mix-blend-mode: lighten;
    }
  }
}
```

![image](https://github.com/openstreetmap/openstreetmap-website/assets/4158490/c1ebf9ac-9755-4262-a444-65d69764704c)


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