docs: Prepare for new sub tree

See #11925

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

@@ -1,50 +0,0 @@
----
-title: Parent
-description:  Returns the parent shortcode context in nested shortcodes.
-categories: []
-keywords: []
-action:
-  related: []
-  returnType: hugolib.ShortcodeWithPage
-  signatures: [SHORTCODE.Parent]
----
-
-This is useful for inheritance of common shortcode parameters from the root.
-
-In this contrived example, the "greeting" shortcode is the parent, and the "now" shortcode is child.
-
-{{< code file=content/welcome.md lang=md >}}
-{{</* greeting dateFormat="Jan 2, 2006" */>}}
-Welcome. Today is {{</* now */>}}.
-{{</* /greeting */>}}
-{{< /code >}}
-
-{{< code file=layouts/shortcodes/greeting.html  >}}
-<div class="greeting">
-  {{ trim .Inner "\r\n" | .Page.RenderString }}
-</div>
-{{< /code >}}
-
-{{< code file=layouts/shortcodes/now.html  >}}
-{{- $dateFormat := "January 2, 2006 15:04:05" }}
-
-{{- with .Params }}
-  {{- with .dateFormat }}
-    {{- $dateFormat = . }}
-  {{- end }}
-{{- else }}
-  {{- with .Parent.Params }}
-    {{- with .dateFormat }}
-      {{- $dateFormat = . }}
-    {{- end }}
-  {{- end }}
-{{- end }}
-
-{{- now | time.Format $dateFormat -}}
-{{< /code >}}
-
-The "now" shortcode formats the current time using:
-
-1. The `dateFormat` parameter passed to the "now" shortcode, if present
-2. The `dateFormat` parameter passed to the "greeting" shortcode, if present
-3. The default layout string defined at the top of the shortcode