Move role folder to defaults

defaults/nextcloud/README.adoc

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+== Nextcloud Role
+
+This role manages the nextcloud installation.
+

defaults/nextcloud/default.nix

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+# Default configuration for hosts
+{ config, lib, pkgs, ... }:
+
+{
+  services.nextcloud = {
+    enable = true;
+    https = true;
+    webfinger = true;
+    maxUploadSize = "1G";
+
+    config = {
+      adminpassFile = "/secrets/nextcloud-admin"; # TODO
+      adminuser = "root";
+      dbtype = "pgsql";
+      dbhost = "/run/postgresql";
+    };
+  };
+
+  systemd.services."nextcloud-setup" = {
+    requires = [ "postgresql.service" ];
+    after = [ "postgresql.service" ];
+  };
+}