docs: Prepare for new sub tree

See #11925

docs/content/en/methods/page/Parent.md

@@ -1,60 +0,0 @@
----
-title: Parent
-description: Returns the Page object of the parent section of the given page.
-categories: []
-keywords: []
-action:
-  related:
-    - methods/page/Ancestors
-    - methods/page/CurrentSection
-    - methods/page/FirstSection
-    - methods/page/InSection
-    - methods/page/IsAncestor
-    - methods/page/IsDescendant
-    - methods/page/Sections
-  returnType: page.Page
-  signatures: [PAGE.Parent]
----
-
-{{% include "methods/page/_common/definition-of-section.md" %}}
-
-{{% note %}}
-The parent section of a regular page is the [current section].
-
-[current section]: /methods/page/currentsection
-{{% /note %}}
-
-Consider this content structure:
-
-```text
-content/
-├── auctions/
-│   ├── 2023-11/
-│   │   ├── _index.md     <-- parent: auctions
-│   │   ├── auction-1.md
-│   │   └── auction-2.md  <-- parent: 2023-11
-│   ├── 2023-12/
-│   │   ├── _index.md     
-│   │   ├── auction-3.md
-│   │   └── auction-4.md
-│   ├── _index.md         <-- parent: home
-│   ├── bidding.md
-│   └── payment.md        <-- parent: auctions
-├── books/
-│   ├── _index.md         <-- parent: home
-│   ├── book-1.md
-│   └── book-2.md         <-- parent: books
-├── films/
-│   ├── _index.md         <-- parent: home 
-│   ├── film-1.md
-│   └── film-2.md         <-- parent: films
-└── _index.md             <-- parent: nil
-```
-
-In the example above, note the parent section of the home page is nil. Code defensively by verifying existence of the parent section before calling methods on its `Page` object. To create a link to the parent section page of the current page:
-
-```go-html-template
-{{ with .Parent }}
-  <a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a>
-{{ end }}
-```