Add link to official mdx-js/vscode-mdx

Closes GH-2098.

Reviewed-by: Titus Wormer <tituswormer@gmail.com>
Reviewed-by: Remco Haszing <remcohaszing@gmail.com>

Co-authored-by: Remco Haszing <remcohaszing@gmail.com>

docs/docs/getting-started.server.mdx

@@ -144,7 +144,7 @@ Once everything is set up in your project, you can enhance the experience by
 adding support for MDX in your editor:
 
 *   With **VS Code**,
-    try [`silvenon/vscode-mdx`](https://github.com/silvenon/vscode-mdx)
+    try [`mdx-js/vscode-mdx`](https://github.com/mdx-js/vscode-mdx)
     and/or [`xyc/vscode-mdx-preview`](https://github.com/xyc/vscode-mdx-preview)
 *   With **Vim**,
     try [`jxnblk/vim-mdx-js`](https://github.com/jxnblk/vim-mdx-js)