nixos/nextcloud: update / clean up the nginx configuration

First of all, a few cleanups were made to make it more readable:

* Reordered the sections by their priority so what you're reading in Nix
  is also what you get in the final nginx.conf.
* Unified media/asset locations

Most notably, this fixes the

    Your web server is not properly set up to resolve "/ocm-provider/".

warning since 27.1.2 where `ocm-provider` was moved from a static
directory in the source tarball to a dynamic HTTP route[1].

Additionally, the following things were fixed:

* The 404 checks for build/tests/etc. are now guaranteed to be before
  the `.php` location match and it's not implicitly relied upon Nix's
  internal attribute sorting anymore.

* `.wasm` files are supported properly and a correct `Content-Type` is
  set.

* For "legacy" routes (e.g. `ocs-provider`/`cron`/etc) a `rewrite` rule
  inside the location for fastcgi is used as recommended by upstream[2].
  This also makes it easier to understand the purpose of the location
  itself (i.e. use fastcgi for PHP code).

[1] https://github.com/nextcloud/documentation/pull/11179
[2] https://docs.nextcloud.com/server/27/admin_manual/installation/nginx.html

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