docs: Prepare for new sub tree

See #11925

docs/content/en/methods/site/Param.md

@@ -1,29 +0,0 @@
----
-title: Param
-description: Returns the site parameter with the given key.
-categories: []
-keywords: []
-action:
-  related: []
-  returnType: any
-  signatures: [SITE.Param KEY]
----
-
-The `Param` method on a `Site` object is a convenience method to return the value of a user-defined parameter in the site configuration.
-
-{{< code-toggle file=hugo >}}
-[params]
-display_toc = true
-{{< /code-toggle >}}
-
-
-```go-html-template
-{{ .Site.Param "display_toc" }} → true
-```
-
-The above is equivalent to either of these:
-
-```go-html-template
-{{ .Site.Params.display_toc }}
-{{ index .Site.Params "display_toc" }}
-```