fix tutorial link

README.md

@@ -4,7 +4,7 @@ Picrawler Python library and examples for Raspberry Pi.
 
 ## Links
 
-- Docs: <https://docs.sunfounder.com/projects/picar-x-v20/en/latest>
+- Docs: <https://docs.sunfounder.com/projects/pi-crawler/en/latest/>
 - Robot Hat: <https://docs.sunfounder.com/projects/robot-hat-v4/en/latest/>
 - Forum: <https://forum.sunfounder.com/>
 - Sunfounder: <https://www.sunfounder.com/>
@@ -13,10 +13,10 @@ Picrawler Python library and examples for Raspberry Pi.
 
 > [!Note]
 You also need to install robot_hat, vilib, sunfounder_controller and other dependent libraries.\
-<https://docs.sunfounder.com/projects/picar-x-v20/en/latest/python/python_start/install_all_modules.html>
+<https://docs.sunfounder.com/projects/pi-crawler/en/latest/python/python_start/install_all_modules.html>
 
 ```bash
-git clone https://github.com/sunfounder/picrawler.git
+git clone --depth 1 https://github.com/sunfounder/picrawler.git
 cd picrawler
 sudo python3 setup.py install