Move best practices up in sidebar

[Blargian]

Summary

As discussed with @chloecdc, moving "Best Practices" up in the sidebar for better visibility

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)
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