Styling: adjust inline code block styling for light-mode

[Blargian]

Summary

Adjusts inline code-block styling in light-mode to make it less distracting:

After (left)
Before (right)

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	Oct 14, 2025 0:59am