Update "Creating a new decoupled CMS Website" docs (#14247)

src/docs/guides/decoupled-cms/README.md

@@ -59,7 +59,7 @@ The newly created website should be able to run, and look like this:
 
 ```xml
 <PropertyGroup>
-  <TargetFramework>net6.0</TargetFramework>
+  <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
 </PropertyGroup>
 ```
 
@@ -81,18 +81,49 @@ builder.Services.AddOrchardCms();
 ```
 
 !!! warning "Razor Pages"
-    `AddRazorPages` must not be called directly as `services.AddOrchardCms()` already invokes it internally.
+    `builder.Services.AddRazorPages()` must not be called directly as `builder.Services.AddOrchardCms()` already invokes it internally.
 
 - Edit the `Program.cs` file
-- Remove everything after `app.UseStaticFiles();` and replace it by `app.UseOrchardCore();` like this:
+- Add `app.UseOrchardCore();` 
+- If any of the following lines exists in your `Program.cs` file, remove them:
 
 ```csharp
-   ...
-
-   app.UseHttpsRedirection();
-   app.UseStaticFiles();
-
-   app.UseOrchardCore();
+  builder.Services.AddRazorPages();
+
+  if (!app.Environment.IsDevelopment())
+  {
+      app.UseExceptionHandler("/Error");
+      app.UseHsts();
+  }
+
+  app.UseHttpsRedirection();
+  app.UseRouting();
+
+  app.UseAuthorization();
+
+  app.MapRazorPages();
+}
+```
+
+Here is a sample of a bare minimum `Program.cs` file
+
+```csharp
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var builder = WebApplication.CreateBuilder(args);
+
+        // Add services to the container.
+        builder.Services.AddOrchardCms();
+
+        var app = builder.Build();
+
+        app.UseStaticFiles();
+        app.UseOrchardCore();
+
+        app.Run();
+    }
 }
 ```