Update references and folder names

system/server/mariadb.nix

@@ -0,0 +1,25 @@
+{pkgs, ...}: {
+  services.mysql = {
+    enable = true;
+    package = pkgs.mariadb;
+    dataDir = "/var/lib/mysql";
+    ensureDatabases = [
+      "minecraft"
+      "photoprism"
+    ];
+    ensureUsers = [
+      {
+        name = "minecraft";
+        ensurePermissions = {
+          "minecraft.*" = "ALL PRIVILEGES";
+        };
+      }
+      {
+        name = "photoprism";
+        ensurePermissions = {
+          "photoprism.*" = "ALL PRIVILEGES";
+        };
+      }
+    ];
+  };
+}