docs: adds link to the menu to the new article and removes deleted article

Author: iOvergaard

16/umbraco-cms/SUMMARY.md

@@ -142,8 +142,8 @@
 * [Extend and customize the editing experience](customizing/overview.md)
 * [Project Bellissima](customizing/project-bellissima.md)
 * [Setup Your Development Environment](customizing/development-flow/README.md)
+  * [Umbraco Extension Template](customizing/development-flow/umbraco-extension-template.md)
   * [Vite Package Setup](customizing/development-flow/vite-package-setup.md)
-  * [TypeScript setup](customizing/development-flow/typescript-setup.md)
 * [Extension Overview](customizing/extending-overview/README.md)
   * [Extension Registry](customizing/extending-overview/extension-registry/README.md)
     * [Extension Registration](customizing/extending-overview/extension-registry/extension-registry.md)