Make a hosts folder for system and home, remove legacy.nix cause I never used it, change some comments

system/server.nix

@@ -1,64 +0,0 @@
-{
-  imports = [
-    # Base configs
-    ./base.nix
-
-    # Import users and groups
-    ./users/jimbo.nix
-    ./users/nextcloud.nix
-    ./users/nginx.nix
-    ./users/liquidsoap.nix
-    ./users/groups.nix
-
-    # Modules
-    ./modules/security.nix
-    ./modules/legacy.nix
-
-    # Hardware
-    ./hardware/machines/server.nix
-    ./hardware/systemdboot.nix
-
-    # Services
-    ./services/openssh.nix
-    ./server/acme.nix
-    ./server/ddclient.nix
-    ./server/icecast.nix
-    ./server/firewall.nix
-    ./server/forgejo.nix
-    ./server/mailserver.nix
-    ./server/mariadb.nix
-    ./server/nginx.nix
-    ./server/owncast.nix
-    ./server/photoprism.nix
-    ./server/minecraft
-    ./server/vaultwarden.nix
-    ./server/transmission.nix
-    ./server/wireguard.nix
-    ./server/misc.nix
-
-    # File server
-    ./server/nextcloud.nix
-    ./server/nfs.nix
-    ./server/samba.nix
-
-    # Matrix
-    ./server/synapse.nix
-    ./server/element.nix
-    ./server/coturn.nix
-    ./server/matrix-discord.nix
-
-    # Federation
-    ./server/lemmy.nix
-    ./server/mastodon.nix
-    ./server/pixelfed.nix
-  ];
-
-  # Set custom openssh port
-  services.openssh.ports = [ 2222 ];
-
-  # Set hostname
-  networking.hostName = "JimServer";
-
-  # https://nixos.wiki/wiki/FAQ/When_do_I_update_stateVersion
-  system.stateVersion = "24.05";
-}