Docs: Don't advertise 'Update Now' on Dashboard until documentation is available

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

When promoting a new version for developers to update to, please provide supporting documentation about that version at the https://aka.ms/dotnet/aspire/update-latest page. Currently, on November 28, 2025, this URL points to release notes for Aspire 13 and not instructions on how to update to Aspire 13.0.1 or information about the Aspire 13.0.1 patch release

### Expected Behavior

The 'Upgrade Instructions' link leads to a page about the promoted version, in this case 13.0.1, with the command-line instructions listed as well as links to release notes so that users can make decisions about applying the update.

### Steps To Reproduce

Start a new project using Aspire 13 or earlier with the default templates and navigate to the dashboard

### Exceptions (if any)

_No response_

### .NET Version info

.NET SDK:
Version: 10.0.100
Commit: b0f34d51fc
Workload version: 10.0.100-manifests.5fb86115
MSBuild version: 18.0.2+b0f34d51f

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26220
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100\

### Anything else?

_No response_