Add back sidebar section which was commented out

[Blargian]

Summary

Sidebar section was commented out causing data formats to not be viewable, as a result pages are also missing sidebars:

(https://github.com/user-attachments/assets/489fd53c-1896-4d23-89d0-e719b5a1a7f2)

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/en/integrations/index.mdx