move ui to experimental

Author: szarnyasg

docs/preview/core_extensions/overview.md

@@ -28,7 +28,7 @@ title: Core Extensions
 | [sqlite]({% link docs/preview/core_extensions/sqlite.md %})             | [<span class="github">GitHub</span>](https://github.com/duckdb/duckdb-sqlite)    | Adds support for reading from and writing to SQLite database files                 | stable       | sqlite_scanner, sqlite3 |
 | [tpcds]({% link docs/preview/core_extensions/tpcds.md %})               |                                                                                  | Adds TPC-DS data generation and query support                                      | experimental |                         |
 | [tpch]({% link docs/preview/core_extensions/tpch.md %})                 |                                                                                  | Adds TPC-H data generation and query support                                       | stable       |                         |
-| [ui]({% link docs/preview/core_extensions/ui.md %})                     | [<span class="github">GitHub</span>](https://github.com/duckdb/duckdb-ui)        | Adds local UI for DuckDB                                                           | stable       |                         |
+| [ui]({% link docs/preview/core_extensions/ui.md %})                     | [<span class="github">GitHub</span>](https://github.com/duckdb/duckdb-ui)        | Adds local UI for DuckDB                                                           | experimental |                         |
 | [vss]({% link docs/preview/core_extensions/vss.md %})                   | [<span class="github">GitHub</span>](https://github.com/duckdb/duckdb-vss)       | Adds support for vector similarity search queries                                  | experimental |                         |
 
 The **Stage** column shows the lifecycle stage of the extension following the convention of the [lifecycle stages used in tidyverse](https://lifecycle.r-lib.org/articles/stages.html).