docs: Prepare for new sub tree

See #11925

docs/content/en/methods/menu-entry/HasChildren.md

@@ -1,67 +0,0 @@
----
-title: HasChildren
-description: Reports whether the given menu entry has child menu entries.
-categories: []
-keywords: []
-action:
-  related:
-    - methods/menu-entry/Children
-  returnType: bool
-  signatures: [MENUENTRY.HasChildren]
----
-
-Use the `HasChildren` method when rendering a nested menu.
-
-With this site configuration:
-
-{{< code-toggle file=hugo >}}
-[[menus.main]]
-name = 'Products'
-pageRef = '/product'
-weight = 10
-
-[[menus.main]]
-name = 'Product 1'
-pageRef = '/products/product-1'
-parent = 'Products'
-weight = 1
-
-[[menus.main]]
-name = 'Product 2'
-pageRef = '/products/product-2'
-parent = 'Products'
-weight = 2
-{{< /code-toggle >}}
-
-And this template:
-
-```go-html-template
-<ul>
-  {{ range .Site.Menus.main }}
-    <li>
-      <a href="{{ .URL }}">{{ .Name }}</a>
-      {{ if .HasChildren }}
-        <ul>
-          {{ range .Children }}
-            <li><a href="{{ .URL }}">{{ .Name }}</a></li>
-          {{ end }}
-        </ul>
-      {{ end }}
-    </li>
-  {{ end }}
-</ul>
-```
-
-Hugo renders this HTML:
-
-```html
-<ul>
-  <li>
-    <a href="/products/">Products</a>
-    <ul>
-      <li><a href="/products/product-1/">Product 1</a></li>
-      <li><a href="/products/product-2/">Product 2</a></li>
-    </ul>
-  </li>
-</ul>
-```