Use pkgs.linuxPackages instead of linuxPackages_latest for
kernelPackages.
Enable the system firewall (networking.firewall.enable = true).
Comment out users.groups.kemp members entry.
Add jdk and gradle to environment.systemPackages.
Enable VirtualBox host and extension pack and add kemp to vboxusers.
Bump nixpkgs and rust-overlay in flake.lock. Add a wud container
(ghcr.io/getwud/wud) on port 8186 and enable paperless on port 8187
with OCR settings and public consumption. Switch homepage theme to
light and set a background image. Comment out onnxruntime CUDA overlay.
