docs: Prepare for new sub tree

See #11925

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

@@ -1,35 +0,0 @@
----
-title: strings.ContainsNonSpace
-description: Reports whether the given string contains any non-space characters as defined by Unicode’s White Space property.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/strings/Contains
-    - functions/strings/ContainsAny
-    - functions/strings/HasPrefix
-    - functions/strings/HasSuffix
-    - functions/collections/In
-  returnType: bool
-  signatures: [strings.ContainsNonSpace STRING]
-aliases: [/functions/strings.containsnonspace]
----
-
-{{< new-in 0.111.0 >}}
-
-```go-html-template
-{{ strings.ContainsNonSpace "\n" }} → false
-{{ strings.ContainsNonSpace " " }} → false
-{{ strings.ContainsNonSpace "\n abc" }} → true
-```
-
-Common white space characters include:
-
-```text
-'\t', '\n', '\v', '\f', '\r', ' '
-```
-
-See the [Unicode Character Database] for a complete list.
-
-[Unicode Character Database]: https://www.unicode.org/Public/UCD/latest/ucd/PropList.txt