Add note to include notebook files for native server (#12449)
## Summary
Similar to https://github.com/astral-sh/ruff-vscode/pull/547 but for the
online docs.
Refer to https://github.com/astral-sh/ruff-vscode/issues/546
## Preview
<img width="1728" alt="Screenshot 2024-07-22 at 14 51 40"
src="https://github.com/user-attachments/assets/39014278-c868-45b0-9058-42858a060fd8">
