Remove API reference and link to swagger

[Blargian]

Summary

The current API Reference pages in the docs duplicate the information available at the swagger page. In some cases there is missing information or very long tables in the case of nested responses where we display a table line per path.

Removes these pages and links more explicitly to the swagger docs.

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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Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview		May 8, 2025 8:05am

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clickhouse-docs-ru	⬜️ Ignored (Inspect)	Visit Preview		May 8, 2025 8:05am
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