update

build.py

@@ -22,7 +22,9 @@ for asset in ASSETS:
     if asset != "sw.js":
         PREFETCH += f'<link rel="prefetch" href="{asset}" />\n'
 
-os.system("rm -r dist ; mkdir -p dist ; cp -r assets/* dist/")
+shutil.rmtree("dist")
+shutil.copytree("assets","dist", dirs_exist_ok=True)
+
 def replace_handles(string):
     string = string.replace("%%PREFETCH%%", PREFETCH)
     string = string.replace("%%VERSIONCO%%", VERSIONCO)