docs: Prepare for new sub tree

See #11925

docs/content/en/functions/reflect/IsMap.md

@@ -1,18 +0,0 @@
----
-title: reflect.IsMap
-description: Reports whether the given value is a map.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/reflect/IsSlice
-  returnType: bool
-  signatures: [reflect.IsMap INPUT]
-aliases: [/functions/reflect.ismap]
----
-
-```go-html-template
-{{ reflect.IsMap (dict "key" "value") }} → true
-{{ reflect.IsMap "yo" }} → false
-```

docs/content/en/functions/reflect/IsSlice.md

@@ -1,18 +0,0 @@
----
-title: reflect.IsSlice
-description: Reports whether the given value is a slice.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/reflect/IsMap
-  returnType: bool
-  signatures: [reflect.IsSlice INPUT]
-aliases: [/functions/reflect.isslice]
----
-
-```go-html-template
-{{ reflect.IsSlice (slice 1 2 3) }} → true
-{{ reflect.IsSlice "yo" }} → false
-```

docs/content/en/functions/reflect/_index.md

@@ -1,12 +0,0 @@
----
-title: Reflect functions
-linkTitle: reflect
-description: Template functions to determine a value's data type.
-categories: []
-keywords: []
-menu:
-  docs:
-    parent: functions
----
-
-Use these functions to determine a value's data type.