docs: Prepare for new sub tree

See #11925

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

@@ -1,21 +0,0 @@
----
-title: strings.HasPrefix
-description: Reports whether the given string begins with the given prefix.
-categories: []
-keywords: []
-action:
-  aliases: [hasPrefix]
-  related:
-    - functions/strings/Contains
-    - functions/strings/ContainsAny
-    - functions/strings/ContainsNonSpace
-    - functions/strings/HasSuffix
-    - functions/collections/In
-  returnType: bool
-  signatures: [strings.HasPrefix STRING PREFIX]
-aliases: [/functions/hasprefix,/functions/strings.hasprefix]
----
-
-```go-html-template
-{{ hasPrefix "Hugo" "Hu" }} → true
-```