docs: Prepare for new sub tree

See #11925

docs/content/en/functions/images/Overlay.md

@@ -1,52 +0,0 @@
----
-title: images.Overlay
-description: Returns an image filter that overlays the source image at the given coordinates, relative to the upper left corner.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/images/Filter
-    - methods/resource/Filter
-  returnType: images.filter
-  signatures: [images.Overlay RESOURCE X Y]
-toc: true
----
-
-## Usage
-
-Capture the overlay image as a resource:
-
-```go-html-template
-{{ $overlay := "" }}
-{{ $path := "images/logo.png" }}
-{{ with resources.Get $path }}
-  {{ $overlay = . }}
-{{ else }}
-  {{ errorf "Unable to get resource %q" $path }}
-{{ end }}
-```
-
-The overlay image can be a [global resource], a [page resource], or a [remote resource].
-
-[global resource]: /getting-started/glossary/#global-resource
-[page resource]: /getting-started/glossary/#page-resource
-[remote resource]: /getting-started/glossary/#remote-resource
-
-Create the filter:
-
-```go-html-template
-{{ $filter := images.Overlay $overlay 20 20 }}
-```
-
-{{% include "functions/images/_common/apply-image-filter.md" %}}
-
-## Example
-
-{{< img
-  src="images/examples/zion-national-park.jpg"
-  alt="Zion National Park"
-  filter="Overlay"
-  filterArgs="images/logos/logo-64x64.png,20,20"
-  example=true
->}}