Remove examples/home and the antigua WireGuard import script

The hand-written port of antigua's router role predates the installer and
the web UI; the router is configured through settings.json now. Its flake
outputs (the home configuration, installer-home, the home check) go too.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AeFqV9dZrK6nipHkPfyM4F

scripts/fast.sh

@@ -1,8 +1,8 @@
 # The quick checks: no VM boots. Catches what most failed runs of the VM tests
 # were about (Go and Nix errors, shellcheck, type errors in the test scripts,
 # assertions). Evaluating NixOS is the cost: about a minute for the default.
-#   router-fast             Go checks; the installer, a settings-built router
-#                           (via the release) and the home gateway build
+#   router-fast             Go checks; the installer and a settings-built router
+#                           (via the release) build
 #   router-fast --drivers   also build every VM test's driver (type-checks the
 #                           test scripts, builds the VMs' systems): minutes
 #   router-fast --all       also every flake check without VMs (assertions,
@@ -40,7 +40,6 @@ fi
 step "systems build (shellcheck of the scripts, units, firewall rules)"
 nix build --no-link --max-jobs 1 \
   .#nixosConfigurations.installer.config.system.build.toplevel \
-  .#nixosConfigurations.home.config.system.build.toplevel \
   .#release
 
 if [ "$drivers" = 1 ]; then
@@ -52,7 +51,7 @@ if [ "$drivers" = 1 ]; then
 fi
 if [ "$all" = 1 ]; then
   step "the checks that need no VM"
-  nix build --no-link --max-jobs 1 .#checks.x86_64-linux.{lib,assertions,example,home}
+  nix build --no-link --max-jobs 1 .#checks.x86_64-linux.{lib,assertions,example}
   step "everything evaluates"
   nix flake check --no-build
 fi