docs: Prepare for new sub tree

See #11925

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

@@ -1,16 +0,0 @@
----
-title: strings.Repeat
-description: Returns a new string consisting of zero or more copies of another string.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related: []
-  returnType: string
-  signatures: [strings.Repeat COUNT INPUT]
-aliases: [/functions/strings.repeat]
----
-
-```go-html-template
-{{ strings.Repeat 3 "yo" }} → yoyoyo
-```