chore: move scripts into subfolders

examples/advanced/01_fibonacci.peb

@@ -0,0 +1,10 @@
+fun fib(n) {
+    if n < 0 {
+        return null
+    } else if n == 0 or n == 1 {
+        return n
+    }
+    return fib(n - 2) + fib(n - 1)
+}
+
+print(fib(10))

main.py

@@ -4,7 +4,7 @@ from src.pebble import Pebble
 
 
 def main():
-    path: Path = Path("examples/16_break_continue.peb")
+    path: Path = Path("examples/basic/16_break_continue.peb")
     Pebble.run_file(path)