docs: Prepare for new sub tree

See #11925

docs/content/en/commands/hugo_new_content.md

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----
-title: "hugo new content"
-slug: hugo_new_content
-url: /commands/hugo_new_content/
----
-## hugo new content
-
-Create new content for your site
-
-### Synopsis
-
-Create a new content file and automatically set the date and title.
-It will guess which kind of file to create based on the path provided.
-
-You can also specify the kind with `-k KIND`.
-
-If archetypes are provided in your theme or site, they will be used.
-
-Ensure you run this within the root directory of your site.
-
-```
-hugo new content [path] [flags]
-```
-
-### Options
-
-```
-  -b, --baseURL string      hostname (and path) to the root, e.g. https://spf13.com/
-      --cacheDir string     filesystem path to cache directory
-  -c, --contentDir string   filesystem path to content directory
-      --editor string       edit new content with this editor, if provided
-  -f, --force               overwrite file if it already exists
-  -h, --help                help for content
-  -k, --kind string         content type to create
-  -t, --theme strings       themes to use (located in /themes/THEMENAME/)
-```
-
-### Options inherited from parent commands
-
-```
-      --clock string               set the clock used by Hugo, e.g. --clock 2021-11-06T22:30:00.00+09:00
-      --config string              config file (default is hugo.yaml|json|toml)
-      --configDir string           config dir (default "config")
-      --debug                      debug output
-  -d, --destination string         filesystem path to write files to
-  -e, --environment string         build environment
-      --ignoreVendorPaths string   ignores any _vendor for module paths matching the given Glob pattern
-      --logLevel string            log level (debug|info|warn|error)
-      --quiet                      build in quiet mode
-  -s, --source string              filesystem path to read files relative from
-      --themesDir string           filesystem path to themes directory
-  -v, --verbose                    verbose output
-```
-
-### SEE ALSO
-
-* [hugo new](/commands/hugo_new/)	 - Create new content for your site
-