remove the bevy based turtle and rename turtle-lib-macroquad to turtle-lib

turtle-lib/examples/hello_turtle.rs

@@ -0,0 +1,14 @@
+//! Minimal turtle example - just 10 lines!
+//!
+//! This is the simplest possible turtle program using the macro.
+
+use turtle_lib::*;
+
+#[turtle_main("Hello Turtle")]
+fn hello() {
+    turtle.set_pen_color(BLUE);
+    for _ in 0..4 {
+        turtle.forward(100.0);
+        turtle.right(90.0);
+    }
+}