Add CH docs to the left nav
What does this MR do and why?
This MR adds two ClickHouse documents to the left navigation.
This MR added the new doc page: gitlab!129198 (merged)
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.
Edited by Adam Hegyi