Files organization

The nix config files are separated in the following folders:

• packages for the self-defined packages that have to be added to the system (i.e. self patched versions of softwares)
• modules for self-defined modules
• machines/xxx one folder xxx for the specific configuration every machine using this configuration of nixos
• profiles/xxx one folder for a set of applications/modules/things i want to get applied

Huge thanks to @tweqx for the patch and nix files for thunderbird passwordCommand !