chore: center <img> tags using CSS

Summary

• chore: center images using CSS

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• Cherry-pick to: none
• Staging:
  • https://docs.binary.picodata.io/picodata/asabirov_center_images_using_css/reference/sql/join/
  • https://docs.binary.picodata.io/picodata/asabirov_center_images_using_css/plugins/gostech_audit_log/