docs: Prepare for new sub tree

See #11925

docs/content/en/functions/os/ReadFile.md

@@ -1,40 +0,0 @@
----
-title: os.ReadFile
-description: Returns the contents of a file.
-categories: []
-keywords: []
-action:
-  aliases: [readFile]
-  related:
-    - functions/os/FileExists
-    - functions/os/Getenv
-    - functions/os/ReadDir
-    - functions/os/Stat
-  returnType: string
-  signatures: [os.ReadFile PATH]
-aliases: [/functions/readfile]
----
-
-The `os.ReadFile` function attempts to resolve the path relative to the root of your project directory. If a matching file is not found, it will attempt to resolve the path relative to the [`contentDir`](/getting-started/configuration#contentdir). A leading path separator (`/`) is optional.
-
-With a file named README.md in the root of your project directory:
-
-```text
-This is **bold** text.
-```
-
-This template code:
-
-```go-html-template
-{{ readFile "README.md" }}
-```
-
-Produces:
-
-```html
-This is **bold** text.
-```
-
-Note that `os.ReadFile` returns raw (uninterpreted) content.
-
-For more information on using `readDir` and `readFile` in your templates, see [Local File Templates](/templates/files).