Move Getting started category to top-level doc set (#20008)

* Move category to top-level doc set

* Move doc set to the top and update short title

* Undo package-lock changes

* updated hardcoded refs in tests

* Update test

* Fix hardcoded link in test

Co-authored-by: Sarah Schneider <sarahs@github.com>

content/get-started/using-github/github-desktop.md

@@ -0,0 +1,22 @@
+---
+title: GitHub Desktop
+intro: '{% data variables.product.prodname_desktop %} extends and simplifies your Git and {% data variables.product.prodname_dotcom %} workflow using a visual interface.'
+versions:
+  free-pro-team: '*'
+  enterprise-server: '*'
+  github-ae: '*'
+topics:
+  - Desktop
+redirect_from:
+  - /github/getting-started-with-github/github-desktop
+  - /github/getting-started-with-github/using-github/github-desktop
+---
+## About {% data variables.product.prodname_desktop %}
+
+{% data reusables.desktop.about-github-desktop %}
+
+For more information about {% data variables.product.prodname_desktop %}, see "[Installing and configuring {% data variables.product.prodname_desktop %}](/desktop/installing-and-configuring-github-desktop)" in the {% data variables.product.prodname_desktop %} documentation.
+
+## Sharing feedback
+
+If you have feedback or feature requests, you can open an issue in the [`desktop/desktop` repository](https://github.com/desktop/desktop).