docs: Prepare for new sub tree

See #11925

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

@@ -1,44 +0,0 @@
----
-title: Ref
-description: Returns the absolute URL of the page with the given path, language, and output format.
-categories: []
-keywords: []
-action:
-  related:
-    - methods/shortcode/RelRef
-    - functions/urls/RelRef
-    - functions/urls/Ref
-  returnType: string
-  signatures: [SHORTCODE.Ref OPTIONS]
----
-
-The map of option contains:
-
-path
-: (`string`) The path to the page, relative to the content directory. Required.
-
-lang
-: (`string`) The language (site) to search for the page. Default is the current language. Optional.
-
-outputFormat
-: (`string`) The output format to search for the page. Default is the current output format. Optional.
-
-The examples below show the rendered output when visiting a page on the English language version of the site:
-
-```go-html-template
-{{ $opts := dict "path" "/books/book-1" }}
-{{ .Ref $opts }} → https://example.org/en/books/book-1/
-
-{{ $opts := dict "path" "/books/book-1" "lang" "de" }}
-{{ .Ref $opts }} → https://example.org/de/books/book-1/
-
-{{ $opts := dict "path" "/books/book-1" "lang" "de" "outputFormat" "json" }}
-{{ .Ref $opts }} → https://example.org/de/books/book-1/index.json
-```
-
-By default, Hugo will throw an error and fail the build if it cannot resolve the path. You can change this to a warning in your site configuration, and specify a URL to return when the path cannot be resolved.
-
-{{< code-toggle file=hugo >}}
-refLinksErrorLevel = 'warning'
-refLinksNotFoundURL = '/some/other/url'
-{{< /code-toggle >}}