Add Sqitch to ClickHouse schema migration tools documentation

[BASadityaSrinivas]

Summary

Adds Sqitch to the Automatic schema migration tools for ClickHouse documentation.
Sqitch recently introduced native support for the ClickHouse database, and this update includes it as one of the recommended schema migration tools.

Issue: #4687

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

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Project	Deployment	Preview	Updated (UTC)
clickhouse-docs	Ready	Preview	Nov 3, 2025 9:30am