remove directory = self from our documentation

docs/nix/render_options/__init__.py

@@ -585,7 +585,7 @@ Each attribute is documented below
 
         ```nix
         buildClan {
-            directory = self;
+            self = self;
             machines = {
                 jon = { };
                 sara = { };

docs/site/manual/migration-guide.md

@@ -81,7 +81,7 @@ For the provide flake example, your flake should now look like this:
   outputs = { self, nixpkgs, ... }:
   let
     clan = clan-core.lib.buildClan {
-        directory = self; # this needs to point at the repository root
+        self = self; # this needs to point at the repository root
         specialArgs = {};
         inventory.meta.name = "NEEDS_TO_BE_UNIQUE"; # TODO: Changeme