general: update gpg/ssh keys and remove public_files from repo

sys/platforms/vps/srv/net.nix

@@ -37,17 +37,7 @@ in {
           enableACME = true;
           locations = {
             "/".root = "${pkgs.local.homepage}";
-
-            "~ ^/public(?:/(.*))?$" = {
-              # https://serverfault.com/a/476368
-              alias = "${../public_files}/$1";
-              extraConfig = ''
-                autoindex on;
-                autoindex_exact_size on;
-                autoindex_localtime on;
-                autoindex_format html;
-              '';
-            };
+            "/.well-known/openpgpkey/hu/".alias = "/var/public/wkd/";
           };
         };
       };