Add Colmena to manage systems, use better pathing for smallfetch, use better mountpoints and hostnames from Colema

hosts/hidden/boot/default.nix

@@ -1,6 +1,7 @@
-{ ... }:
+{ pkgs, ... }:
 {
   boot = {
+    kernelPackages = pkgs.linuxPackages_6_14;
     loader.systemd-boot.enable = true;
     plymouth.enable = true;
   };