redirect pad.hacc.earth to pad.hacc.space

this should redirect visitors to pad.hacc.earth back to
pad.hacc.space. (this was requested in the matrix room, to make it
easier to communicate to people that pads moved yet again).

hosts/hainich/services/codimd.nix

@@ -82,4 +82,10 @@
       '';
     };
   };
+
+  services.nginx.virtualHosts."pad.hacc.earth" = {
+    forceSSL = true;
+    enableACME = true;
+    locations."/".return = "301 https://pac.hacc.space$request_uri";
+  };
 }