correct the docs link

Author: thiennn

src/SimplCommerce.WebHost/Themes/SampleTheme/Areas/Core/Views/Home/Index.cshtml

@@ -8,7 +8,7 @@
 <div>
     <h2 class="page-header">Sample Theme</h2>
     <p>It's very easy to find and install new themes or create your own theme. </p>
-    <p>Check out <a href="http://docs.simplcommerce.com/en/latest/theme-development/" target="_blank"> the doc here</a> for more details</p>
+    <p>Check out <a href="https://docs.simplcommerce.com/developer-guide/theme-development.html" target="_blank"> the doc here</a> for more details</p>
 </div>
 
 <partial name="_WidgetInstances" model="Model.WidgetInstances.Where(x => x.WidgetZoneId == WidgetZoneIds.HomeMainContent)" />