docs: Prepare for new sub tree

See #11925

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

@@ -1,24 +0,0 @@
----
-title: strings.CountRunes
-description: Returns the number of runes in the given string excluding whitespace.
-categories: []
-keywords: []
-action:
-  aliases: [countrunes]
-  related:
-    - functions/go-template/len
-    - functions/strings/Count
-    - functions/strings/CountWords
-    - functions/strings/RuneCount
-  returnType: int
-  signatures: [strings.CountRunes INPUT]
-aliases: [/functions/countrunes]
----
-
-In contrast with the [`strings.RuneCount`] function, which counts every rune in a string, `strings.CountRunes` excludes whitespace.
-
-```go-html-template
-{{ "Hello, 世界" | strings.CountRunes }} → 8
-```
-
-[`strings.RuneCount`]: /functions/strings/runecount