remove unneeded sidebar_custom_props

Author: Blargian

src/pages/index.mdx

@@ -8,8 +8,6 @@ pagination_next: null
 hide_title: true
 id: 'home-page'
 description: 'Docs homepage'
-sidebar_custom_props:
-hidden: true
 ---
 
 import ClickHouseLogo from '@site/src/icons/ClickHouseLogo';