docs/home-manager: eval options without checking config definitions

By default `lib.evalModules` will check all config definitions match
a declared option (or a freeform type), leading to errors like:

    error: The option `wrapRc' does not exist.

Setting `_module.freeformType` or `_module.check` will disable this,
allowing us to evaluate the option declaration without checking the
config definitions.

docs/default.nix

@@ -42,8 +42,12 @@ let
     ];
   };
 
-  hmOptions = builtins.removeAttrs (lib.evalModules { modules = [ ../wrappers/modules/hm.nix ]; })
-    .options [ "_module" ];
+  hmOptions = builtins.removeAttrs (lib.evalModules {
+    modules = [
+      ../wrappers/modules/hm.nix
+      { _module.check = false; } # Ignore missing option declarations
+    ];
+  }).options [ "_module" ];
 
   options-json =
     (pkgs.nixosOptionsDoc {

wrappers/hm.nix

@@ -22,14 +22,6 @@ let
     };
     modules = [
       ./modules/hm.nix
-      # FIXME: this can't go in ./modules/hm.nix because we eval that module in the docs _without_ nixvim's modules
-      {
-        _file = ./hm.nix;
-        config = {
-          wrapRc = lib.mkOptionDefault false;
-          impureRtp = lib.mkOptionDefault true;
-        };
-      }
     ];
   };
 in

wrappers/modules/hm.nix

@@ -13,4 +13,9 @@
   };
 
   imports = [ ./enable.nix ];
+
+  config = {
+    wrapRc = lib.mkOptionDefault false;
+    impureRtp = lib.mkOptionDefault true;
+  };
 }