common: move to modules, move some files out, modules: adjust dir structure

modules/nixos/services/homeserver/uptime-kuma.nix

@@ -0,0 +1,17 @@
+{ config, ... }:
+
+{
+  services.caddy.virtualHosts."uptime-kuma.wo2wz.fyi".extraConfig =
+    assert config.services.caddy.enable;
+    ''
+      import default-settings
+      import cloudflare-tls
+
+      reverse_proxy localhost:8005
+    '';
+
+  services.uptime-kuma = {
+    enable = true;
+    settings.PORT = "8005";
+  };
+}