feat: Split all the services into their own files

nixos/mirai/services/jellyfin.nix

@@ -0,0 +1,13 @@
+{...}: {
+  services = {
+    jellyfin = {
+      enable = true;
+      openFirewall = true;
+    };
+    caddy = {
+      virtualHosts."media.darksailor.dev".extraConfig = ''
+        reverse_proxy localhost:8096
+      '';
+    };
+  };
+}