Merge pull request #4600 from ClickHouse/Blargian-patch-811056

House keeping: remove duplicate page

Author: Blargian

docs/about-us/index.md

@@ -12,7 +12,6 @@ the table of contents below for a list of pages in this section of the docs.
 
 | Page                                                                       | Description                                                                                                                                                                                                       |
 |----------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| [What is ClickHouse](/about-clickhouse)                                    | Introduces ClickHouse's core features, architecture, and uses, providing a concise overview for new users.                                                                                                        |
 | [Adopters](/about-us/adopters)                                             | A list of companies using ClickHouse and their success stories, assembled from public sources                                                                                                                     |
 | [Support](/about-us/support)                                               | An introduction to ClickHouse Cloud support services and their mission.                                                                                                                                           |
 | [Beta features and experimental features](/beta-and-experimental-features) | Learn about how ClickHouse uses "Beta" and "Experimental" labels to distinguish between officially supported and early-stage, unsupported features due to varied development speeds from community contributions. |

docs/about-us/intro.mdx

@@ -1188,7 +1188,6 @@ const sidebars = {
       collapsed: false,
       collapsible: false,
       items: [
-        "about-us/intro",
         "about-us/adopters",
         "about-us/support",
         "about-us/beta-and-experimental-features",