Add clean_up script

docs/clean_up.py

@@ -0,0 +1,18 @@
+from pathlib import Path
+import shutil
+
+root = Path(__file__).parent  # ./docs
+
+target_folders = [
+    root / "build",
+    root / "examples" / "imgs",
+    root / "source" / "api" / "APIs",
+    root / "source" / "examples",
+    root / "source" / "how_to",
+]
+
+
+if __name__ == "__main__":
+    for folder in target_folders:
+        if folder.exists():
+            shutil.rmtree(folder)