chore: import upstream snapshot with attribution

docs/mkdocs/hooks/remove_announcement.py

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import os
+from pathlib import Path
+from typing import Literal
+
+
+def on_startup(command: Literal["build", "gh-deploy", "serve"], dirty: bool):
+    # see https://docs.readthedocs.io/en/stable/reference/environment-variables.html # noqa
+    if os.getenv("READTHEDOCS_VERSION_TYPE") == "tag":
+        # remove the warning banner if the version is a tagged release
+        mkdocs_dir = Path(__file__).parent.parent
+        announcement_path = mkdocs_dir / "overrides/main.html"
+        # The file might be removed already if the build is triggered multiple
+        # times (readthedocs build both HTML and PDF versions separately)
+        if announcement_path.exists():
+            os.remove(announcement_path)