[openstreetmap/openstreetmap-website] MIME type mismatch preventing CSS from loading (Issue #5079)

[Zeke Farwell]

### URL

https://www.openstreetmap.org/

### How to reproduce the issue?

I'm finding osm.org to be fairly unusable at the moment as the CSS is not loading.   I've tried clearing the browser cache but that has not helped.  In Firefox I'm seeing this error in the dev tools console:

> The resource from “https://www.openstreetmap.org/assets/screen-ltr-4b8b2b903e4c2372327208c82022baac871edd2bd02de9aa49b6a2b630bfac61.css” was blocked due to MIME type (“text/plain”) mismatch (X-Content-Type-Options: nosniff)

And a similar error in Chrome:

> Refused to apply style from 'https://www.openstreetmap.org/assets/screen-ltr-4b8b2b903e4c2372327208c82022baac871edd2bd02de9aa49b6a2b630bfac61.css' because its MIME type ('text/plain') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

I asked if other people were seeing the same on the OSM US Slack and the OSM World Discord.  It seems that for some people the site is working normally but some others have confirmed they are seeing the same things as me.  I'm also seeing the same on my phone.  


### Screenshot(s) or anything else?

![Screenshot 2024-08-14 at 5 36 02 PM](https://github.com/user-attachments/assets/4365f2e6-02a3-432c-bb2f-81b3e9221c29)
![Screenshot 2024-08-14 at 5 35 51 PM](https://github.com/user-attachments/assets/76e3b83a-2d4a-458e-84a7-659363efcebd)


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