docs: Prepare for new sub tree

See #11925

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

@@ -1,23 +0,0 @@
----
-title: strings.TrimPrefix
-description: Returns the given string, removing the prefix from the beginning of the string.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/strings/Chomp
-    - functions/strings/Trim
-    - functions/strings/TrimLeft
-    - functions/strings/TrimRight
-    - functions/strings/TrimSuffix
-  returnType: string
-  signatures: [strings.TrimPrefix PREFIX STRING]
-aliases: [/functions/strings.trimprefix]
----
-
-```go-html-template
-{{ strings.TrimPrefix "a" "aabbaa" }} → abbaa
-{{ strings.TrimPrefix "aa" "aabbaa" }} → bbaa
-{{ strings.TrimPrefix "aaa" "aabbaa" }} → aabbaa
-```