Update README.md - broken link #146

[thotheod]

broken link. There is no "global" User Guide. Instructions are given per scenario.

• [ ] Update to documentation

Checklist

• [ ] I'm sure there are no other open Pull Requests for the same update/change
• [ ] My corresponding pipelines / checks run clean and green without any errors or warnings
• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (readme)
• [ ] I did format my code