docs: init new structure

docs/site/guides/inventory/autoincludes.md

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+# Auto-included Files
+
+Clan automatically imports specific files from each machine directory and registers them, reducing the need for manual configuration.
+
+## Machine Registration
+
+Every folder under `machines/{machineName}` is automatically registered as a Clan machine.
+
+!!! info "Files loaded automatically for each machine"
+
+The following files are detected and imported for every Clan machine:
+
+- [x] `machines/{machineName}/configuration.nix`
+  Main configuration file for the machine.
+
+- [x] `machines/{machineName}/hardware-configuration.nix`
+  Hardware-specific configuration generated by NixOS.
+
+- [x] `machines/{machineName}/facter.json`
+  Contains system facts. Automatically generated — see [nixos-facter](https://clan.lol/blog/nixos-facter/) for details.
+
+- [x] `machines/{machineName}/disko.nix`
+  Disk layout configuration. See the [disko quickstart](https://github.com/nix-community/disko/blob/master/docs/quickstart.md) for more info.
+
+## Other Auto-included Files
+
+* **`inventory.json`**
+  Managed by Clan's API.
+  Merges with `clan.inventory` to extend the inventory.
+
+* **`.clan-flake`**
+  Sentinel file to be used to locate the root of a Clan repository.
+  Falls back to `.git`, `.hg`, `.svn`, or `flake.nix` if not found.