Change a lot, mostly adding 3 Minecraft servers and Velocity

nixos/server/minecraft/servers/blockworld.nix

@@ -0,0 +1,17 @@
+{pkgs, ...}: let
+  common = import ../common.nix { inherit pkgs; };
+in {
+  services.minecraft-servers.servers.blockworld = {
+    enable = true;
+    autoStart = false;
+    package = pkgs.paperServers.paper-1_21_1;
+    jvmOpts = "-Xmx4084M";
+    serverProperties = common.serverProperties // {
+      difficulty = 2;
+      server-port = 30012;
+      motd = "§fArchival §l§n§cBloxelcom §r§fMinecraft server.";
+    };
+    whitelist = common.whitelist;
+    symlinks = common.symlinks;
+  };
+}