docs: Prepare for new sub tree

See #11925

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

@@ -1,36 +0,0 @@
----
-title: collections.Seq
-description: Returns a slice of integers.
-categories: []
-keywords: []
-action:
-  aliases: [seq]
-  related: []
-  returnType: '[]int'
-  signatures:
-    - collections.Seq LAST
-    - collections.Seq FIRST LAST
-    - collections.Seq FIRST INCREMENT LAST
-aliases: [/functions/seq]
----
-
-```go-html-template
-{{ seq 2 }} → [1 2]
-{{ seq 0 2 }} → [0 1 2]
-{{ seq -2 2 }} → [-2 -1 0 1 2]
-{{ seq -2 2 2 }} → [-2 0 2]
-```
-
-A contrived example of iterating over a sequence of integers:
-
-```go-html-template
-{{ $product := 1 }}
-{{ range seq 4 }}
-  {{ $product = mul $product . }}
-{{ end }}
-{{ $product }} → 24
-```
-
-{{% note %}}
-The slice created by the `seq` function is limited to 2000 elements.
-{{% /note %}}