Redirects: add redirect from time-series-analysis to time-series functions page

[Blargian]

We merged time-series analysis functions into the time-series page. Adding redirect for the now removed time-series-analysis page.

Summary

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs	Ready	Preview	Comment	Oct 25, 2025 10:09am

3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	Ignored			Oct 25, 2025 10:09am
clickhouse-docs-ru	Ignored			Oct 25, 2025 10:09am
clickhouse-docs-zh	Ignored			Oct 25, 2025 10:09am

[Copilot]

Pull Request Overview

This PR adds a redirect from the deprecated time-series-analysis-functions page to the consolidated time-series-functions page, following the merge of time-series analysis functions into a single documentation page.

Key changes:

• Added a permanent redirect configuration in vercel.json to handle navigation from the old URL to the new unified time-series functions page

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