mod(style): styling and color revamp now with fewer characters to print to the terminal

examples/container.zig

@@ -22,8 +22,12 @@ pub fn main() !void {
     var renderer = zterm.Renderer.Buffered.init(allocator);
     defer renderer.deinit();
 
-    var container = try App.Container.init(allocator, .{});
-    try container.append(try App.Container.init(allocator, .{}));
+    var container = try App.Container.init(allocator, .{
+        .border = .{ .color = .green, .corners = .rounded },
+    });
+    try container.append(try App.Container.init(allocator, .{
+        .border = .{ .color = .light_green, .corners = .squared },
+    }));
     defer container.deinit();
 
     // NOTE: should the min-size here be required?