docs: Prepare for new sub tree

See #11925

docs/content/en/commands/hugo_convert_toJSON.md

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----
-title: "hugo convert toJSON"
-slug: hugo_convert_toJSON
-url: /commands/hugo_convert_tojson/
----
-## hugo convert toJSON
-
-Convert front matter to JSON
-
-### Synopsis
-
-toJSON converts all front matter in the content directory
-to use JSON for the front matter.
-
-```
-hugo convert toJSON [flags] [args]
-```
-
-### Options
-
-```
-  -h, --help   help for toJSON
-```
-
-### 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)
-  -o, --output string              filesystem path to write files to
-      --quiet                      build in quiet mode
-  -s, --source string              filesystem path to read files relative from
-      --themesDir string           filesystem path to themes directory
-      --unsafe                     enable less safe operations, please backup first
-  -v, --verbose                    verbose output
-```
-
-### SEE ALSO
-
-* [hugo convert](/commands/hugo_convert/)	 - Convert your content to different formats
-