Train Simulator Developer Documentation - Website Shut Down?

Hello, everyone,

I was recently looking for help developing for Train Sim and I knew https://tscdevdocs.co.uk/ was a relieble source. However, (if you click on the link you'll see) the website domain seems to have expired. If anyone knows why this has happened or if they have moved the website, any help would be appreciated.

Thanks,
Anson