nixos/nextcloud: clarify support status of apps in the manual

Realized that this is something, I discussed with Benedikt, but wasn't
written down somewhere.

Changed files
+14 -1
nixos
modules
services
web-apps
+14 -1
nixos/modules/services/web-apps/nextcloud.md
···
Alternatively, extra apps can also be declared with the [](#opt-services.nextcloud.extraApps) setting.
When using this setting, apps can no longer be managed statefully because this can lead to Nextcloud updating apps
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that are managed by Nix. If you want automatic updates it is recommended that you use web interface to install apps.
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that are managed by Nix:
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```nix
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{ config, pkgs, ... }: {
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services.nextcloud.extraApps = with config.services.nextcloud.package.packages.apps; [
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inherit user_oidc calendar contacts;
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];
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}
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```
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Keep in mind that this is essentially a mirror of the apps from the appstore, but managed in
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nixpkgs. This is by no means a curated list of apps that receive special testing on each update.
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If you want automatic updates it is recommended that you use web interface to install apps.
## Known warnings {#module-services-nextcloud-known-warnings}