docs: Prepare for new sub tree

See #11925

docs/content/en/functions/time/Duration.md

@@ -1,46 +0,0 @@
----
-title: time.Duration
-description: Returns a time.Duration value using the given time unit and  number.
-categories: []
-keywords: []
-action:
-  aliases: [duration]
-  related:
-    - functions/time/AsTime
-    - functions/time/Format
-    - functions/time/Now
-    - functions/time/ParseDuration
-  returnType: time.Duration
-  signatures: [time.Duration TIME_UNIT NUMBER]
-aliases: [/functions/duration]
----
-
-The `time.Duration` function returns a [`time.Duration`] value that you can use with any of the `Duration` [methods].
-
-This template:
-
-```go-html-template
-{{ $duration := time.Duration "hour" 24 }}
-{{ printf "There are %.0f seconds in one day." $duration.Seconds }}
-```
-
-Is rendered to:
-
-```text
-There are 86400 seconds in one day.
-```
-
-The time unit must be one of the following:
-
-
-Duration|Valid time units
-:--|:--
-hours|`hour`, `h`
-minutes|`minute`, `m`
-seconds|`second`, `s`
-milliseconds|`millisecond`, `ms`
-microseconds|`microsecond`, `us`, `µs`
-nanoseconds|`nanosecond`, `ns`
-
-[`time.Duration`]: https://pkg.go.dev/time#Duration
-[methods]: /methods/duration