Simplify: Git hooks via nix flake check (no systemd, no activation, deleted module)

hosts/astyanax/default.nix

@@ -40,8 +40,7 @@ in
     # ../../modules/vpn/wireguard.nix
     (import ../../modules/secrets { inherit lib inputs config; })
     ../../modules/docker
-    # ../../modules/syncthing
-    ../../modules/git-hooks
+    ../../modules/syncthing
   ];
 
   home-manager.users.${username} = import ../../home/hosts/astyanax {