docs: Prepare for new sub tree

See #11925

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

@@ -1,40 +0,0 @@
----
-title: images.UnsharpMask
-description: Returns an image filter that sharpens an image.
-categories: []
-keywords: []
-action:
-  aliases: []
-  related:
-    - functions/images/Filter
-    - methods/resource/Filter
-  returnType: images.filter
-  signatures: [images.UnsharpMask SIGMA AMOUNT THRESHOLD]
-toc: true
----
-
-The sigma parameter is used in a gaussian function and affects the radius of effect. Sigma must be positive. The sharpen radius is approximately 3 times the sigma value.
-
-The amount parameter controls how much darker and how much lighter the edge borders become. Typically between 0.5 and 1.5.
-
-The threshold parameter controls the minimum brightness change that will be sharpened. Typically between 0 and 0.05.
-
-## Usage
-
-Create the filter:
-
-```go-html-template
-{{ $filter := images.UnsharpMask 10 0.4 0.03 }}
-```
-
-{{% include "functions/images/_common/apply-image-filter.md" %}}
-
-## Example
-
-{{< img
-  src="images/examples/zion-national-park.jpg"
-  alt="Zion National Park"
-  filter="UnsharpMask"
-  filterArgs="10,0.4,0.03"
-  example=true
->}}