feat: add gatus entry for each subdomain

modules/templates/web-feature.nix

@@ -1,6 +1,8 @@
 let
   port = 0000;
   certloc = "/var/lib/acme/fi33.buzz";
+  hostname = "feature.fi33.buzz";
+  url = "https://${hostname}";
 in
 {
   services = {
@@ -20,7 +22,7 @@ in
     #   ];
     # };
 
-    caddy.virtualHosts."feature.fi33.buzz".extraConfig = ''
+    caddy.virtualHosts.${hostname}.extraConfig = ''
       reverse_proxy localhost:${toString port}
       tls ${certloc}/cert.pem ${certloc}/key.pem {
         protocols tls1.3