docs: Prepare for new sub tree

See #11925

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

@@ -1,59 +0,0 @@
----
-title: strings.Trim
-description: Returns the given string, removing leading and trailing characters specified in the cutset.
-categories: []
-keywords: []
-action:
-  aliases: [trim]
-  related:
-    - functions/strings/Chomp
-    - functions/strings/TrimLeft
-    - functions/strings/TrimPrefix
-    - functions/strings/TrimRight
-    - functions/strings/TrimSuffix
-  returnType: string
-  signatures: [strings.Trim INPUT CUTSET]
-aliases: [/functions/trim]
----
-
-```go-html-template
-{{ trim "++foo--" "+-" }} → foo
-```
-
-To remove leading and trailing newline characters and carriage returns:
-
-```go-html-template
-{{ trim "\nfoo\n" "\n\r" }} → foo
-{{ trim "\n\nfoo\n\n" "\n\r" }} → foo
-
-{{ trim "\r\nfoo\r\n" "\n\r" }} → foo
-{{ trim "\r\n\r\nfoo\r\n\r\n" "\n\r" }} → foo
-```
-
-The `strings.Trim` function is commonly used in shortcodes to remove leading and trailing newlines characters and carriage returns from the content within the opening and closing shortcode tags.
-
-For example, with this markdown:
-
-```text
-{{</* my-shortcode */>}}
-Able was I ere I saw Elba.
-{{</* /my-shortcode */>}}
-```
-
-The value of `.Inner` in the shortcode template is:
-
-```text
-\nAble was I ere I saw Elba.\n
-```
-
-If authored on a Windows system the value of `.Inner` might, depending on the editor configuration, be:
-
-```text
-\r\nAble was I ere I saw Elba.\r\n
-```
-
-This construct is common in shortcode templates:
-
-```go-html-template
-{{ trim .Inner "\n\r" }}
-```