nixos/home-assistant: move module into home-automation category

Putting so many things into misc is not great, so let's open up a new
category called home-automation here and now.

nixos/modules/module-list.nix

@@ -450,6 +450,7 @@
   ./services/hardware/undervolt.nix
   ./services/hardware/vdr.nix
   ./services/hardware/xow.nix
+  ./services/home-automation/home-assistant.nix
   ./services/logging/SystemdJournal2Gelf.nix
   ./services/logging/awstats.nix
   ./services/logging/filebeat.nix
@@ -545,7 +546,6 @@
   ./services/misc/headphones.nix
   ./services/misc/heisenbridge.nix
   ./services/misc/greenclip.nix
-  ./services/misc/home-assistant.nix
   ./services/misc/ihaskell.nix
   ./services/misc/input-remapper.nix
   ./services/misc/irkerd.nix