Refreshing the WASDK and WinUI overview pages (#5971)

* Refactoring WASDK page

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update windows-app-sdk-overview.png

* Updates

* Update index.md

* More changes

* More winui changes

* Fixes

* adding hero bar

* Replacing old winui logos

* Adding WinUI Gallery

* Update index.md

* Tweaks

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Fix layout

* Feedback from Roy

* Fix notifications links

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update index.md

* Update hub/apps/windows-app-sdk/index.md

Co-authored-by: Jim Walker <[email protected]>

* Update hub/apps/windows-app-sdk/index.md

Co-authored-by: Jim Walker <[email protected]>

* Update hub/apps/windows-app-sdk/index.md

Co-authored-by: Jim Walker <[email protected]>

* Update hub/apps/windows-app-sdk/index.md

Co-authored-by: Jim Walker <[email protected]>

* Update hub/apps/windows-app-sdk/index.md

Co-authored-by: Jim Walker <[email protected]>

* Fix broken table

* Update index.md

* Update links in index.md

---------

Co-authored-by: Jim Walker <[email protected]>

Author: niels9001

hub/apps/develop/ui/controls/images/winui-logo-16x16.png

@@ -846,7 +846,7 @@ items:
     items:
     - name: Windows App SDK
       items:
-      - name: Overview of Windows App SDK
+      - name: Overview
         href: windows-app-sdk/index.md
       - name: Windows App SDK and supported Windows releases
         href: windows-app-sdk/support.md