docs: Prepare for new sub tree

See #11925

docs/content/en/commands/hugo_mod.md

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----
-title: "hugo mod"
-slug: hugo_mod
-url: /commands/hugo_mod/
----
-## hugo mod
-
-Various Hugo Modules helpers.
-
-### Synopsis
-
-Various helpers to help manage the modules in your project's dependency graph.
-Most operations here requires a Go version installed on your system (>= Go 1.12) and the relevant VCS client (typically Git).
-This is not needed if you only operate on modules inside /themes or if you have vendored them via "hugo mod vendor".
-
-
-Note that Hugo will always start out by resolving the components defined in the site
-configuration, provided by a _vendor directory (if no --ignoreVendorPaths flag provided),
-Go Modules, or a folder inside the themes directory, in that order.
-
-See https://gohugo.io/hugo-modules/ for more information.
-
-
-
-### Options
-
-```
-  -h, --help   help for mod
-```
-
-### 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](/commands/hugo/)	 - hugo builds your site
-* [hugo mod clean](/commands/hugo_mod_clean/)	 - Delete the Hugo Module cache for the current project.
-* [hugo mod get](/commands/hugo_mod_get/)	 - Resolves dependencies in your current Hugo Project.
-* [hugo mod graph](/commands/hugo_mod_graph/)	 - Print a module dependency graph.
-* [hugo mod init](/commands/hugo_mod_init/)	 - Initialize this project as a Hugo Module.
-* [hugo mod npm](/commands/hugo_mod_npm/)	 - Various npm helpers.
-* [hugo mod tidy](/commands/hugo_mod_tidy/)	 - Remove unused entries in go.mod and go.sum.
-* [hugo mod vendor](/commands/hugo_mod_vendor/)	 - Vendor all module dependencies into the _vendor directory.
-* [hugo mod verify](/commands/hugo_mod_verify/)	 - Verify dependencies.
-