docs: Prepare for new sub tree

See #11925

docs/content/en/functions/math/Rand.md

@@ -1,46 +0,0 @@
----
-title: math.Rand
-description: Returns a pseudo-random number in the half-open interval [0.0, 1.0).
-categories: []
-keywords: []
-action:
-  aliases: []
-  related: []
-  returnType: float64
-  signatures: [math.Rand]
----
-
-{{< new-in 0.121.2 >}}
-
-The `math.Rand` function returns a pseudo-random number in the [half-open interval] [0.0, 1.0).
-
-```go-html-template
-{{ math.Rand }} → 0.6312770459590062
-```
-
-To generate a random integer in the [closed interval] [0, 5]:
-
-```go-html-template
-{{ math.Rand | mul 6 | math.Floor }}
-```
-
-To generate a random integer in the closed interval [1, 6]:
-
-```go-html-template
-{{ math.Rand | mul 6 | math.Ceil }}
-```
-
-To generate a random float, with one digit after the decimal point, in the closed interval [0, 4.9]:
-
-```go-html-template
-{{ div (math.Rand | mul 50 | math.Floor) 10 }}
-```
-
-To generate a random float, with one digit after the decimal point, in the closed interval [0.1, 5.0]:
-
-```go-html-template
-{{ div (math.Rand | mul 50 | math.Ceil) 10 }}
-```
-
-[closed interval]: /getting-started/glossary/#interval
-[half-open interval]: /getting-started/glossary/#interval