Merge develop into production

See merge request !577

Upgrade to NixOS 24.11

Closes #193

See merge request !576

Command used: `update-nixpkgs`

update production

See merge request !571

bump nixpkgs version

See merge request !572

update production

See merge request !568

bump nixpkgs version

See merge request !570

update production

See merge request !564

Configure NixOS to keep fewer old kernels around

See merge request !567

bump nixpkgs version

See merge request !565

Refs #190

update production

See merge request !562

bump nixpkgs version

See merge request !563

update production

See merge request !560

bump nixpkgs version

See merge request !561

update production

See merge request !556

bump nixpkgs version

See merge request !558

bump nixpkgs version

See merge request !557

update production

See merge request !554

bump nixpkgs version

See merge request !555

update production

See merge request !552

bump nixpkgs version

See merge request !553

update production

See merge request !549

bump nixpkgs version

See merge request !551

Fix space usage dashboard:  Use the same colors as for other machines

See merge request !546

update production

See merge request !548

bump nixpkgs version

See merge request !547

bind-mounting the nix store r/o made that FS turn up twice in the list,
resulting in the graph showing the wrong colors for the machines.