Revert "docker: archlinux: Install nekoray."

This reverts commit 451de26.

Fails to install with error:

    (1/2) Arming ConditionNeedsUpdate...
    (2/2) Updating the desktop file MIME type cache...
    + install_nekoray
    + yay --noconfirm -S nekoray
     - Avoid running yay as root/sudo.
     AUR Explicit (1): nekoray-4.0.1-2
     Sync Dependency (6): protobuf-28.3-1, yaml-cpp-0.8.0-2, qt6-svg-6.8.1-1, qt6-base-6.8.1-1, zxing-cpp-2.2.1-1, qt6-tools-6.8.1-1
     Sync Make Dependency (2): go-2:1.23.4-1, cmake-3.31.3-1
     :: (0/1) Failed to download PKGBUILD: nekoray
      - error fetching nekoray: System has not been booted with systemd as init system (PID 1). Can't operate.
      Failed to connect to system scope bus via local transport: Host is down
               context: exit status 1

    The command '/bin/sh -c /usr/local/bin/build.sh' returned a non-zero code: 1
    make: *** [Makefile:4: archlinux-systemd] Error 1

dotfiles/docker/archlinux/build.sh

@@ -92,11 +92,6 @@ install_vscode()
     yay --noconfirm -S vscode
 }
 
-install_nekoray()
-{
-    yay --noconfirm -S nekoray
-}
-
 main()
 {
     pacman --noconfirm -Syu
@@ -108,7 +103,6 @@ main()
     install_idea
     install_pycharm
     install_vscode
-    install_nekoray
 }
 
 main "$@"