feat!: dynamically create hosts

This commit completely restructures the flake. Hosts are now seperate
from profile configuration files in hosts/[system]. Nixos and Darwin
configurations will be built when present in the respective folders in hosts/

profiles/server/nixos/restic.nix

@@ -0,0 +1,8 @@
+{ lib, config, ... }:
+{
+  config = lib.mkIf config.swarselsystems.server.restic {
+
+    # TODO
+
+  };
+}