Rename to match actual subcommand

src/main.zig

@@ -6,7 +6,7 @@ const yazap = @import("yazap");
 const Message = zits.MessageParser.Message;
 const Server = zits.Server;
 
-const serverSubcommand = @import("./subcommand/server.zig").main;
+const serve = @import("./subcommand/serve.zig").main;
 
 pub fn main() !void {
     var dba: std.heap.DebugAllocator(.{}) = .init;
@@ -69,7 +69,7 @@ pub fn main() !void {
             info.server_name = name;
         }
 
-        try serverSubcommand(gpa, info);
+        try serve(gpa, info);
         return;
     } else if (matches.subcommandMatches("pub")) |_| {
         std.debug.print("Unimplemented\n", .{});