The redirects from this file were moved to the Docusaurus configuration file.
If you need to add a redirect please either open a PR in 
https://github.com/clickhouse/clickhouse-docs adding the redirect to
https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
or open an issue in the same repo and provide the old URL and new URL to have
the redirect added.