I now already have nix shells as well as compose.yaml files for
projects. Those were split and are now migrated into a common folder.
That should keep main directory clean and self document that those files
relate to projects, not home manager or systems.
Remove flakes for now.
I will use shells for now to not have a mixed setup.
Add composer v1 for a single customer project as overlay due to usage in
shell instead of flakes.
Adjust folder to not have unnecessary deep structure.
Add shell for reuter monorepo using composer v1.
Daniel Siepmann