Rename to Ymerflow

GitHub Issue: #15 State: open Labels: cleanup

Description

Migrated from deprecated-nagelfluh #19 (originally by @redhog)

• [x] Rename the repo
• [ ] Rename all files
• [ ] Rename all functions, classes
• [ ] Update all docs accordingly
• [ ] Make sure there are no remaining references anywhere to the working name Nagelfluh left.