[openstreetmap/openstreetmap-website] Map tiles are blurry on iOS: suboptimal viewport tag? (Issue #4220)

[Stillhart]

### URL

https://www.openstreetmap.org/#map=14/47.3619/8.5343

### How to reproduce the issue?

1. Open openstreetmap.org on a high resolution iOS device like an iPad or iPhone.
2. Compare the sharpness to the surrounding UI

Devices I used: iPhone 12 mini, iPad Pro 2021

### Screenshot(s) or anything else?

I assume and really hope it's some HTML header tag that's not optimally set, especially the viewport:
`<meta name="viewport" content="width=device-width, initial-scale=1">`
https://github.com/openstreetmap/openstreetmap-website/blob/master/app/views/layouts/_head.html.erb#L3

Maybe it's a fundamental limitation of tiles, then please go on and close this issue. At least it's documented until we get vector tiles :-)

Here are some screenshots to understand the situation. Compare the sharpness of "OpenStreetMap" to the sharpness of the tiles. It's especially noticable around non-map UI.
![IMG_85022](https://github.com/openstreetmap/openstreetmap-website/assets/9038148/65e07eb4-2400-4cf6-a4bc-b7fb6ffc0f70)

Here is the full screenshot
![IMG_8502](https://github.com/openstreetmap/openstreetmap-website/assets/9038148/03d2b465-fd13-45f8-8691-1b5e3937e245)


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