docs: Prepare for new sub tree

See #11925

docs/content/en/functions/collections/Shuffle.md

@@ -1,22 +0,0 @@
----
-title: collections.Shuffle
-description: Returns a random permutation of a given array or slice.
-categories: []
-keywords: []
-action:
-  aliases: [shuffle]
-  related:
-    - functions/collections/Reverse
-    - functions/collections/Sort
-    - functions/collections/Uniq
-  returnType: any
-  signatures: [collections.Shuffle COLLECTION]
-aliases: [/functions/shuffle]
----
-
-```go-html-template
-{{ shuffle (seq 1 2 3) }} → [3 1 2] 
-{{ shuffle (slice "a" "b" "c") }} → [b a c] 
-```
-
-The result will vary from one build to the next.