Dot Net Tutorial section completely crashing.

### Describe the bug I have tried, several times loading this page. But the same issue persisted. <img width="1893" height="866" alt="Image" src="https://github.com/user-attachments/assets/70e21327-ff0c-4cec-b42f-f7fae2968ee9" /> ### Reproduction steps 1. Visit the rabbitmq site. 2. Go to Tutorials and Dotnet Section 3. Click on any dotnet based tutorial to replicate the issue. ... ### Expected behavior The relevant dotnet topic should open like this in the attached image. This is after analysis and finding out the issue on my pc after cloning the branch. Attached the working example. <img width="1852" height="913" alt="Image" src="https://github.com/user-attachments/assets/9ae757a7-557f-44ac-8bcb-cbe9e16803d0" /> ### Additional context The [docusaurus-theme-github-codeblock] theme was trying to fetch code from GitHub URLs embedded in the.NET tutorials (the reference syntax like ```csharp reference https://github.com/...). When these fetches failed, the component was attempting to render the error object directly in JSX. Reference syntax will now be rendered as regular code blocks without attempting to fetch from GitHub, eliminating the fetch failures.