Rebrand as Playpen.

build.zig

@@ -21,7 +21,7 @@ pub fn build(b: *std.Build) void {
     });
 
     const exe = b.addExecutable(.{
-        .name = "vtabs",
+        .name = "playpen",
         .root_module = b.createModule(.{
             .root_source_file = b.path("src/main.zig"),
             .target = target,