Revert "Merge helper method into new code location"

This reverts commit b330ff5.

Author: caendesilva

packages/framework/src/Framework/Features/Navigation/NavigationMenuGenerator.php

@@ -96,17 +96,10 @@ protected function usesGroups(): bool
 
             return $this->routes->first(fn (Route $route): bool => filled($route->getPage()->navigationMenuGroup())) !== null;
         } else {
-            return Config::getString('hyde.navigation.subdirectories', 'hidden') === 'dropdown' || $this->hasGroupExplicitlySetInFrontMatter();
+            return Config::getString('hyde.navigation.subdirectories', 'hidden') === 'dropdown';
         }
     }
 
-    private function hasGroupExplicitlySetInFrontMatter(): bool
-    {
-        return $this->routes->contains(function (Route $item): bool {
-            return ($item->getPage()->navigationMenuGroup() !== null) && (! $item->getPage() instanceof DocumentationPage);
-        });
-    }
-
     protected function canAddRoute(Route $route): bool
     {
         if (! $route->getPage()->showInNavigation()) {