fix: use correct start scripts for federations

[xoac]

1. The start.sh scripts is now in correct folder
2. cleanup functions try kill all PIDs (it didn't worked if one of process exited on it's own - for example when address was in use).

[urkle]

@xoac we also need to update the README.md files to reference port 4000 instead of port 3000 as rover starts the router on port 4000 now.