Styling: fix link color on admonition blocks

[Blargian]

Summary

Fixes:

E.g. https://clickhouse.com/docs/operations/system-tables/iceberg_metadata_log

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	Comments	Updated (UTC)
clickhouse-docs	Error		Comment	Oct 23, 2025 0:15am

3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	Ignored			Oct 23, 2025 0:15am
clickhouse-docs-ru	Ignored			Oct 23, 2025 0:15am
clickhouse-docs-zh	Ignored			Oct 23, 2025 0:15am