docs: Prepare for new sub tree

See #11925

docs/content/en/functions/strings/CountWords.md

@@ -1,20 +0,0 @@
----
-title: strings.CountWords
-description: Returns the number of words in the given string.
-categories: []
-keywords: []
-action:
-  aliases: [countwords]
-  related:
-    - functions/go-template/len
-    - functions/strings/Count
-    - functions/strings/CountRunes
-    - functions/strings/RuneCount
-  returnType: int
-  signatures: [strings.CountWords INPUT]
-aliases: [/functions/countwords]
----
-
-```go-html-template
-{{ "Hugo is a static site generator." | countwords }} → 6
-```