[BUG] <developer guide not accesible>

### Version

404 error

### Bug Description

https://eclipse-xfsc.github.io/developer-guide provide only 404 error

### Steps to Reproduce

https://eclipse-xfsc.github.io/developer-guide
404 appears

### Expected Behavior

https://eclipse-xfsc.github.io/developer-guide

### Logs / Screenshots

```shell
https://eclipse-xfsc.github.io/developer-guide
```

### Operating System

macOS