Removes variant docs from index and toc

Author: rossgrambo

articles/azure-app-configuration/TOC.yml

@@ -158,12 +158,6 @@
         href: howto-targetingfilter.md
       - name: ASP.NET Core
         href: howto-targetingfilter-aspnet-core.md
-    - name: Use variant feature flags
-      items:
-      - name: Overview
-        href: use-variant-feature-flags.md
-      - name: ASP.NET Core
-        href: use-variant-feature-flags-aspnet-core.md
     - name: Run experiments with variant feature flags
       items:
       - name: ASP.NET Core

articles/azure-app-configuration/index.yml

@@ -162,8 +162,6 @@ landingContent:
           url: howto-timewindow-filter.md
         - text: Roll out features to targeted audience
           url: howto-targetingfilter.md
-        - text: Use variant feature flags
-          url: use-variant-feature-flags.md
         - text: Run experiments with variant feature flags
           url: run-experiments-aspnet-core.md
       - linkListType: reference