quad: Move all tests scripts into a tests folder

quad/xsdk_workspace/modular_quad_pid/src/hw_impl_zybo_tests.c

@@ -230,7 +230,7 @@ int test_zybo_global_timer() {
  * 2) Set the RUN_TESTS macro in main.c
  * 3) Uncomment only this test in main.c
  * 4) Run main.c
- * 5) Execute quad/scripts/test_zybo_uart.py
+ * 5) Execute quad/scripts/tests/test_zybo_uart.py
  *    - Observe test results on terminal
  *    - You might be able to see LED MIO7 blink when it receives bytes
  */