config(EJ2-26156): commit for update the github samples with .NET Core preview4

Author: kmuthukumar3032

ej2-blazor-samples/wwwroot/styles/index.css

@@ -1584,6 +1584,9 @@ propertye pane
     font-weight: 500;
     padding-left: 10px;
   }
+  .sb-github-btn{
+    display: none;
+  }
   .sb-mobile-header-buttons {
     display: table;
   }