add(examples/styles): color palette to showcase all available colors to render (except for .default)

examples/layouts/vertical.zig

@@ -51,7 +51,6 @@ pub fn main() !void {
     const element = quit_text.element();
 
     var container = try App.Container.init(allocator, .{
-        .border = .{},
         .layout = .{
             .gap = 2,
             .padding = .{ .top = 5, .bottom = 3, .left = 3, .right = 3 },