docs: Prepare for new sub tree

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docs/content/en/commands/hugo_mod_npm_pack.md

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----
-title: "hugo mod npm pack"
-slug: hugo_mod_npm_pack
-url: /commands/hugo_mod_npm_pack/
----
-## hugo mod npm pack
-
-Experimental: Prepares and writes a composite package.json file for your project.
-
-### Synopsis
-
-Prepares and writes a composite package.json file for your project.
-
-On first run it creates a "package.hugo.json" in the project root if not already there. This file will be used as a template file
-with the base dependency set. 
-
-This set will be merged with all "package.hugo.json" files found in the dependency tree, picking the version closest to the project.
-
-This command is marked as 'Experimental'. We think it's a great idea, so it's not likely to be
-removed from Hugo, but we need to test this out in "real life" to get a feel of it,
-so this may/will change in future versions of Hugo.
-
-
-```
-hugo mod npm pack [flags] [args]
-```
-
-### 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
-  -h, --help                help for pack
-  -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 mod npm](/commands/hugo_mod_npm/)	 - Various npm helpers.
-