Add an option to opt out of telemetry

probably, need to generate a whole set of more pages under "no-telemetry" folder?

The issue does not name any files or entry points; first inspect the repository structure and search for telemetry-related pages or configuration, including the proposed "no-telemetry" folder. Done means the site provides a defined way to opt out of telemetry and the resulting pages or behavior are documented and verifiable.

Written by the indexing model from the issue text.