Refactor: Initial step

- Added library for common functions
- Moved machines/ to hosts/
- Automise adding new hosts to the flake

lib/hosts.nix

@@ -0,0 +1,26 @@
+{ lib }:
+
+{
+  mkHosts = {
+    modules,
+    nixpkgs,
+    inputs,
+    path ? (builtins.toString ../hosts),
+  }: let
+    hosts = lib.getDirsInDir path;
+    common = {
+      system = "x86_64-linux";
+      modules = modules;
+    };
+  in
+    builtins.trace "Hosts found: ${builtins.toString hosts}"
+    builtins.trace "Path being used: ${path}"
+    builtins.listToAttrs (builtins.map (host: {
+      name = host;
+      value = nixpkgs.lib.nixosSystem {
+        system = common.system;
+        modules = common.modules ++ [ ../hosts/${host} ];
+        specialArgs = { inherit inputs; };
+      };
+    }) hosts);
+}