This patch ensures that latest Nextcloud works flawlessly again on our
`nginx`. The new config is mostly based on upstream recommendations
(again)[1]:
* Trying to access internals now results in a 404.
* All `.php`-routes get properly resolved now.
* Removed 404/403 handling from `nginx` as the app itself takes care of
this. Also, this breaks the `/ocs`-API.
* `.woff2?`-files expire later than other assets like images.
Closes#95293
[1] https://docs.nextcloud.com/server/latest/admin_manual/installation/nginx.html
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