fix download path

data/misc/install_offline_docs.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+import os
+import pathlib
+import shutil
+import sys
+
+src = pathlib.Path(sys.argv[1])
+dest = pathlib.Path(os.environ['MESON_INSTALL_DESTDIR_PREFIX']) / sys.argv[2]
+if not (src / 'index.html').exists():
+    sys.exit(0)
+if dest.exists():
+    shutil.rmtree(dest)
+shutil.copytree(src, dest)